Abstract

The record power conversion efficiency of small-area perovskite solar cells has impressively exceeded 25%. For commercial application, a large-area device is the necessary next step. Recently, significant progress has been achieved in fabricating efficient large-area perovskite solar cells. In this review, we will summarize recent achievements in large-area perovskite solar cells including the deposition methods as well as growth control of the large-area, high-quality perovskite layer and also the charge transport layer. Finally, we will give our insight into large-area perovskite solar cells.

© 2020 Chinese Laser Press

1. INTRODUCTION

Inorganic-organic hybrid perovskite solar cells (PSCs) have been one of the brightest spotlights in the photovoltaic research field in recent years. Their power conversion efficiency (PCE) has risen from 3.9% to 25.2% since 2009 [19], which surpasses the most effective thin-film solar cells such as CuInGaSe (CIGS) and CdTe and could be comparable with crystal silicon solar cells [10]. This remarkable progress is due to its excellent optoelectronic properties: excellent light absorption coefficient (105cm1), long carrier diffusion lengths (>1μm), and high defect tolerance [11]. Despite these impressive achievements, most high PCEs of PSCs are recorded on small areas and fabricated by spin-coating methods, typically around 0.1cm2 [1214].

When considering commercial application, it is necessary to fabricate large-area PSCs. The area of most modules is greater than or equal to 1cm2 and less than or equal to 800cm2. According to different substrate materials, large-area PSCs can be divided into rigid and flexible types. So far, the champion cell efficiency of the flexible cell is 19.11% [15], and the world-best efficiency for a flexible perovskite module is about 15% with an area of 30cm2 [16]. To date, there are also significant progress in rigid large-area device fabrication.

For example, Han et al. attempted to fabricate 1cm2 large-area perovskite solar cells by traditional spin coating in 2015 via heavily doped inorganic charge extraction layers in PSCs, and a PCE>15% in 1cm2 cells was obtained [17]. In 2017, Sargent and co-workers used chlorine-capped TiO2(Cl-TiO2) films as an electron transport layer, which suppressed interface nonradiative recombination in solution-processed PSCs. A certified PCE of 19.5% for active areas of 1.1cm2 was achieved [18]. In the same year, Seok et al. reported that the introduction of excessive iodide ions into the solution of perovskite, which through an intramolecular exchange process formed the perovskite layers and decreased the concentration of deep-level defects, resulted in obtaining a certified PCE of 19.7% in 1cm2 [6]. Later, our group reported a 1cm2 perovskite solar cell with efficiency of 20.1% by optimization of grain boundary passivation with PbI2 [19].

However, it is a crucial challenge to produce a large-area device with an area larger than 5cm×5cm by using a conventional spin-coating method. Several scalable deposition techniques have been developed to prepare perovskite films, such as doctor blading, inkjet printing, and slot-die coating. Some progressed have also been made in preparing large-area PSCs by these methods. For example, in 2015, by using bladed MAPbI3 films, a maximum PCE of 15.1% in approximately 6.45 cm2 substrates was achieved. In 2018, through adding L-α-phosphatidylcholine in perovskite ink, the blading coating rate was controlled, and a smoother perovskite film was obtained, resulting in stabilized module PCE of 15.3% and 14.6% measured at aperture areas of 33.0cm2 and 57.2cm2, respectively [20,21]. In 2017, Han et al. reached a certified PCE of 12.1% with an aperture area of 36.1cm2 by a pressure-processing method for the deposition of perovskite films [22].

In addition to the above-mentioned published results, some companies have also achieved good results in developing large-area PSCs. In 2019, Microquanta Semiconductor reported large-area perovskite modules (about 20cm2) with a PCE of 18.04% [23]. A PCE of 16.1% was also reported by Panasonic for a submodule (55 series cells) with an area of 802cm2 [24]. The efficiency for flexible PSCs with single junctions for large-area modules reported by Toshiba and Nedo stands at 11.7% with an area of 703cm2 [25].

In this mini-review, we will briefly summarize the progress in large-area perovskite solar cells, including optimization of the deposition method as well as growth control of the large-area, high-quality of perovskite layer and also the charge transport layer (CTL). Finally, a perspective of PSCs is also included.

2. DEPOSITION METHODS OF LARGE-AREA PEROVSKITE SOLAR CELLS

At present, PSCs can be divided into rigid and flexible PSCs, according to different substrate materials used to prepare large-area PSCs. Large-area solar cell fabrication technologies [such as doctor-blade coating, slot-die coating, inkjet printing, and roll to roll (R2R)] can be used not only to manufacture flexible PSCs but also to produce rigid PSCs. Next, we briefly summarize these methods for preparing large-area PSCs.

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Table 1. Photovoltaic Performance of Perovskite Solar Cells Prepared by Different Methods

A. 1cm2 Device by Spin Coating

Spin coating has been widely used to fabricate small PSCs (0.1cm2) and large devices with area of 1cm2 as well. The main advantage of the spin-coating method is that the preparation method is simple, and the chemical component and the thickness of the perovskite film can be easily controlled.

The spin-coating method includes one-step and two-step spin-coating methods. The preparation process of spin coating is shown in Figs. 1(a) and 1(b) [26]. For one-step spin coating, briefly, the halide organic salt [e.g., methylammonium iodide (MAI), formamidinium iodide (FAI)] and lead halide (PbI2, PbBr2, or their mixture) powders are mixed and dissolved in a solvent such as N,N-dimethylformamide (DMF) or dimethyl sulfoxide (DMSO). The mixed solution is spun on the CTL of electrons or holes, and the perovskite films were formed after annealing. In 2015, Chen et al. published in Science the most compelling report for large-area PSCs [Fig. 1(c)]. This work is prepared using n-i-p structure PSCs, using Nb-doped TiO2 as the electron transport layer (ETL) and Li-Mg-co-doped NiO as the hole transport layer (HTL) in planar PSCs. Meanwhile, using one-step deposition of a PbI2/MAI mixture, a certified efficiency of 15% with the device area of 1.02cm2 was reported [17].

 

Fig. 1. (a) One-step deposited perovskite films. (b) Two-step deposited perovskite films. (c) J-V curve of the best large cell endowed with anti-reflection film. (d) J-V curve of the PSCs in large size of 1cm2 measured under reverse and forward scan under one-sun condition. (a), (b) Reproduced with permission [26], Copyright 2018, Royal Society of Chemistry. (c) Reproduced with permission [17], Copyright 2015, American Association for the Advancement Science. (d) Reproduced with permission [19], Copyright 2017, Nature Publishing Group.

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For the two-step spin-coating method, lead halide and halide organic salt powders are dissolved in DMF and isopropanol (IPA), respectively. First, the lead halide solution is spin coated on the ETL/HTL, and then it is annealed. Subsequently, the MAI solution is spin coated on lead halide surface, and the perovskite films are obtained after annealing by interdiffusion. In 2018, You et al. obtained 1cm2 perovskite solar cells with the efficiency of 20.1% by two-step spin coating and controlled the residual PbI2 on the perovskite surface [Fig. 1(d)] [19].

For the spin-coating method, the disadvantage is that the material utilization rate is too low, and it is difficult to form a pinhole-free and uniform perovskite film on a larger area of the substrates, so it is not conducive to preparing large perovskite films (>1cm2). The spin-coating method for preparing perovskite layers is mostly done in an inert gas glove box, where different types of perovskite components can be selected. But the preparation of larger perovskite layers by methods such as doctor-blade coating and spray coating needs to be performed in air. MAPbI3 precursor solution is mostly used to prepare larger-area perovskite layers due to its more stable structure at room temperature, while FAPbI3 and CsPbI3 perovskite phases (α-FAPbI3 and α-CsPbI3) are unable to be used at room temperature and easily transformed into nonperovskite phases (δ-FAPbI3 and δ-CsPbI3) through thermodynamic phase transformation [27].

B. Blade Coating

The first attempt to replace spin coating in the processing of large-area PSCs was the blade-coating method. Blade coating has been widely used for large-area film deposition due to its high material utilization and fast R2R process [24]. Figure 2(a) shows the setup for the blade-coating technique for fabricating perovskite films onto substrates. Specifically, a perovskite precursor solution was dropped onto CTL covered transparent conductive electrode (TCO) substrates, and it was swiped linearly by a glass blade with a suitable speed [28]. The thickness of the perovskite films during doctor-blade coating was controlled by the perovskite precursor solution concentration, the blading speed, and the spacing of the doctor blade and the substrates.

 

Fig. 2. (a) Schematic illustration for the blade coating of perovskite film in the Landau–Levich mode. (b) The perovskite film’s thickness as a function of blade-coating speed by coating a 1 mol/L MAPbI3/DMF solution on a 145°C preheated substrate. (c) Schematic illustration for N2-knife-assisted blade coating of perovskite films. (d) Schematic illustration showing the drying of ink into a perovskite/intermediate film and full crystallization of a perovskite film. VNCS, volatile noncoordinating solvent; NVCS, nonvolatile coordinating solvent. (a) Reproduced with permission [21], Copyright 2018, Nature Publishing Group. (b)–(d) Reproduced with permission [29], Copyright 2019, American Association for the Advancement Science.

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Compared with the spin-coating process, the solvent evaporation rate of the perovskite film coated by the blade is relatively slow, which facilitates the growth of larger crystals, but it is difficult to form a dense film through the natural drying process. To address this issue, in 2018 Huang et al. bladed a perovskite precursor solution (ink) over a preheated substrate (typically70145°C). As the solvent evaporates, the perovskite precursor material crystallizes into black solid perovskite films. The preheating of the substrates can speed up blade coating and suppress the formation of needle-like structures in the perovskite films [Fig. 2(a)] [21]. In 2019, Huang et al. reported a method to accelerate liquid layer drying at room temperature by introducing a nitrogen knife (N2 knife) after a fixed distance blade and applying a nitrogen flow [Figs. 2(b) and 2(c)]. A 2% volatile noncoordinating solvent (VNCS) is introduced into nonvolatile coordinating solvent (NVCS) to dissolve the perovskite powder, which can achieve rapid drying at room temperature, but also achieve larger perovskite grains. Finally, a certified PSC module with an efficiency of 16.4% and an area of 63.7cm2 was obtained [29].

For blade coating, the biggest challenge in preparing large-area PSCs may be forming perovskite films without pinholes. Therefore, the perovskite precursor solution is very important for preparing a perovskite thin film by the blade-coating method.

C. Slot-Die Coating

Slot-die coating [Fig. 3(a)] is similar to blade coating, that is, it uses a continuously supplied ink reservoir with a thin slit to apply ink over the substrate. However, slot-die coating shows better yield and reproducibility than blade coating when the ink is already fully developed. Thus, it has more potential to be applied in both sheet-to-sheet (S2S) and R2R coating fabrication in the future [30].

 

Fig. 3. (a) Schematic illustration of the key steps involved in slot-die coating of perovskite thin films. (b) and (c) Schematic drawing of a module and J-V curve of an organometal halide perovskite solar cell, respectively. (d) The slot-die coating process for preparing CH3NH3PbI3 films. (e) and (f) 15.24 cm × 15.24 cm perovskite module and I-V curve, respectively. (a) Reproduced with permission [30], Copyright 2018, Royal Society of Chemistry. (b) and (c) Reproduced with permission [31], Copyright 2014, Wiley. (d) Reproduced with permission [33], Copyright 2018, Elsevier. (e) and (f) Reproduced with permission [34], Copyright 2018, Elsevier.

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Several attempts have been made to apply the slot-die coating technique to fabricate large-area PSCs on both flexible and rigid substrates. In 2015, slot-die coating was first applied to fabricate large-area PSCs, with a device configuration of ETL(ZnO)/MAPbI3/HTL (P3HT), using an air knife to dry the wet film. First, a uniform PbI2 layer was formed by N2 gas quenching assisted slot-die coating, and then MAI solution was dipped onto PbI2 and converted into a perovskite film. In addition to the perovskite layer, the inorganic ZnO and polymeric P3HT were also coated using the slot-die coating. The temperature of the substrate and air knife also influence the resulting film morphology and photoelectric performance. After optimization of coating speed and substrate temperature, a PCE of 11.96% was obtained for the size of 0.1cm2 [Figs. 3(b) and 3(c)] [31,32]. In 2018, Gao and co-workers added 10mg·mL1NH4Cl into the perovskite solution, where PCEs of 15.57% was obtained using the slot-die coating processes [Fig. 3(d)] [33]. In the same year, Galagan and co-workers, with utilization of the slot-die coating process, demonstrated 168.75cm2 and 149.5cm2 PSCs [Fig. 3(e)] with PCEs of 11.1% and 11.8%, respectively [Fig. 3(f)] [34].

Notwithstanding these potential advantages, there are still numerous challenges that must be overcome in order to obtain continuous and stable thin perovskite films for high-efficiency large-area PSCs, such as preparing the appropriate perovskite ink and selecting the appropriate blade knife.

D. Spray Coating

Spray coating is a low-temperature coating technology that is suitable for scale-up and is a widely used deposition technique in industry. Its advantages are that it can manufacture PSCs devices with low cost, high volume, rapid manufacturing, and high material utilization. Spray coating generally relies on the use of relatively low-concentration “inks.” The solvent evaporates to dry the ink to produce a film of the desired thickness, which is in stark contrast to the use of blade coatings and slot-die coatings to make films.

Spray-coating processes can be broken down into four stages [Fig. 4(a)]: (i) the generation of the ink droplets, (ii) the transport of the droplets to the substrate, (iii) the coalescence of the droplets into a wet film, and (iv) the drying of the thin film [35].

 

Fig. 4. (a) Schematic of concurrently pumped ultrasonic spray coating for perovskite precursor deposition. (b) A spray-coated four-cell module (3.8cm2) from the 75% (molar fraction) PbAc2 with PbCl2. (c) and (d) Schematic representation of the megasonic spray-coating process and J-V curves of perovskite solar cells, respectively. (a) and (b) Reproduced with permission [35], Copyright 2016, Royal Society of Chemistry. (c) and (d) Reproduced with permission [38], Copyright 2018, Wiley.

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In recent years, researchers have also made some progress in the preparation of PSCs by the spray-coating method. For example, in 2014, Barrows et al. reported a method for manufacturing planar heterojunction CH3NH3PbI3-xClx PSCs using ultrasonic spraying as a deposition technique under environmental conditions, forming an active layer in an inverted structure PV device (p-i-n) and achieving peak PSCs with a PCE of 11%. They found that the temperature of the substrate during spraying, the volatility of the solvent, and the post-deposition annealing temperature all determined the efficiency of the PSCs [36]. In 2016, Tait et al. further improved the efficiency of PSCs based on CH3NH3PbIxBr3-x with an active area of 3.8cm2 to 11.7% by quickly and accurately optimizing the precursor ratio [Fig. 4(b)] [35]. In the same year, Im and co-workers, by controlling the redissolution and crystal grain growth of the MAPbI3-xClx mixed halide perovskite film via spray coating, fabricated a submodule (10cm×10cm, active area 40cm2) with a PCE of 15.5% [37]. In 2018, Choi et al. applied megasonic spray coating to the fabrication of large-area PSCs (1cm2), with a PCE of 14.2% [Figs. 4(c) and 4(d)] [38].

As with other technologies, the use of spraying also faces similar challenges, that is, the crystallization of the perovskite itself must be controlled to form a high-quality perovskite film in order to obtain higher efficiency and more stable large-area PSCs.

E. Inkjet Printing

Inkjet printing is familiar to most people in the form of desktop office printers and is widely used commercially. The main processing advantages of this method are that it can scale from laboratory scale to large-scale production with low cost and low material consumption. Its working principle is to eject the precise deposition and fixation on the ink substrate in the form of droplets from the nozzle. The two most common approaches are shown in Figs. 5(a) and 5(b): (i) continuous inkjet printing (CIP) and (ii) drop-on-demand (DOD) inkjet printing [39,40].

 

Fig. 5. Schematic diagrams for the two main inkjet-printing methods: (a) continuous inkjet printing (CIJ); (b) drop-on-demand (DOD) inkjet printing. (c) 10cm×10cm device and (d) 10cm×5cm device. (e) Schematic illustration of PSC fabrication through inkjet printing with vacuum annealing. (f) J–V curves of PSCs on inkjet printing with active area 2.02cm2. (a) and (b) Reproduced with permission [40], Copyright 2019, Wiley. (c) and (d) Reproduced with permission [41], Copyright 2016, Royal Society of Chemistry. (e) Reproduced with permission [42], Copyright 2018, Wiley. (f) Reproduced with permission [43], Copyright 2018, Elsevier.

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Fig. 6. (a)–(c) Roll-to-roll processing setup for continuous preparation of perovskite solar cells. (a) Reproduced with permission [34], Copyright 2018, Elsevier. (b) Reproduced with permission [44], Copyright 2019, Wiley. (c) Reproduced with permission [45], Copyright 2019, Wiley.

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Since the advent of PSCs, great progress has been made in the preparation of large-area PSCs by inkjet printing. In 2016, Mhaisalkar et al. completed the upgrade of PSC modules under high-efficiency and stable conditions using solution processing and low-cost electrode materials. Monolithic perovskite modules of size 10cm×10cm (active area 70cm2) and 10cm×5cm (active area 31cm2) with PCEs of 10.74% and 10.46% were obtained, respectively [Figs. 5(c) and 5(d)] [41]. In 2018, Xing et al. demonstrated that high-quality perovskite films could be inkjet printed by innovative vacuum-assisted thermal annealing post-treatment and optimized solvent composition.

High-performance PSCs based on printed CH3NH3PbI3 with a PCE of 13.27% for 4.0cm2 was demonstrated [Fig. 5(e)] [42]. In the same year, Song et al. used a two-step printing method and designed a PbI2 ink precursor with a different solvent composition, and then they used MAI vapor as a reactant to convert PbI2 to MAPbI3, which resulted in a PSC with an area of 2.02cm2 and a PCE of 17.74% [Fig. 5(f)] [43].

Although some achievements have been made, there are also some challenges in the production of high-efficiency large-area PSCs by the inkjet printing method, for example, the development of printable perovskite inks and durability of the print head.

F. Roll to Roll

R2R printing technology is a method for preparing large-area PSCs. Compared with other preparation methods, its preparation speed is very fast, and its cost is the most competitive. At present, the continuous R2R process is being used to prepare PSCs on flexible substrates.

In 2018, Gao et al. developed blowing-assisted drop-casting (BADC) in conjunction with an NH4Cl additive to prepare MACH3NH3PbI3 films in air. The NH4Cl additive was critical to form high-quality perovskite films. The optimized formulation is then successfully applied to R2R on a flexible substrate, giving a record PCE of 11.16% with an area of 6.25cm2 [Fig. 6(a)] [34]. In 2019, a nonelectroactive polymer [polyethyleneimine ethoxylate (PEIE)] was used in perovskite to significantly improve its humidity tolerance by Kim et al. They also reported a hot slot-die coating method that can be used for the fabrication of PSCs via an R2R process in air. By optimizing the preparation process, they obtained a flexible perovskite solar cell with a photoelectric conversion efficiency of 11.7% [Fig. 6(b)] [44]. In the same year, gravure printing was successfully applied for the fabrication of flexible PSCs for the first time by Seo et al. A PCE of 9.7% was achieved for partly R2R processed PSCs based on a two-step fabrication of the perovskite layer [Fig. 6(c)] [45].

G. Other Novel Approaches

In addition to the above-mentioned classic preparation methods, in order to improve the efficiency of large-area PSCs, researchers have also improved the preparation methods and developed some novel preparation methods to fabricate high-quality perovskite. For example, in 2016, Grätzel et al. used a vacuum-flash-assisted solution process to fabricate high-efficiency large-area PSCs; an illustration of the nucleation/crystallization procedures during the formation of perovskite film via vacuum-flash-assisted solution processing is shown in Fig. 7(a). This method enabled them to fabricate perovskite films with larger grain size than those created through the conventional processes [Fig. 7(b)]. By this method, they obtained PSCs with a maximum PCE of 20.5% and a certified PCE of 19.6% with an area of more than 1cm2 [46]. In 2017, the pressure-processing method for the deposition of perovskite films was used by Han et al. They applied pressure via a pneumatically driven squeezing board, which spread the liquid precursor under the PI film [Figs. 7(c) and 7(d)]. The pressure was held for 60 s and then unloaded. The assembly was put on a hotplate at 50°C for 2 min. After peeling off the PI film at a speed of 50mm·s1, a dense and uniform perovskite film with a larger grain size was formed in air at room temperature. They achieved a certified PCE of 12.1% with an aperture area of 36.1cm2 for a mesoporous TiO2-based perovskite solar module architecture [20]. The photovoltaic performance of large-area PSCs prepared by different methods is summarized in Table 1.

 

Fig. 7. (a) Schematic illustration of vacuum-flash-assisted solution processing (VASP). (b) Surface scanning electron microscope (SEM) images of the perovskite films fabricated by the conventional process and vacuum-assisted solution process. (c) Diagram of the pressure-processing method for the deposition of perovskite films. (d) Surface SEM images of the perovskite films fabricated by the pressure-processing method and spin coating. (a) and (b) Reproduced with permission [20], Copyright 2015, Royal Society of Chemistry. (c) and (d) Reproduced with permission [46], Copyright 2016, American Association for the Advancement of Science.

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3. GROWTH OF HIGH-QUALITY LARGE-AREA PEROVSKITE FILMS

Although there are many works for fabricating large-area PSCs, their efficiency still lags behind that of those small-area devices that are fabricated by spin coating (Fig. 8) [47]. No matter which method is used to prepare large-area PSCs, the preparation of high-quality perovskite films is the key factor to further improve the efficiency of PSCs [48]. The following is a brief summary of current methods for improving the quality of perovskite films for large-area PSCs and the photovoltaic performance of large-area PSCs with different additive strategies will be summarized in Table 2.

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Table 2. Photovoltaic Performance of Perovskite Solar Cells Prepared by Using Different Materials as Additives for Perovskite Layers

 

Fig. 8. Evolution of the best reported lab-cell (0.1cm2) efficiencies and large-area (1.0cm2) device efficiencies. Reproduced with permission [47], Copyright 2018, American Association for the Advancement of Science.

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A. Solvent Engineering

Solvents that dissolve or process perovskite precursors often show different boiling points and polarities. These will affect the crystallization process.

N, N-dimethylformamide (DMF) is widely used as a solvent for the preparation of PbI2 or perovskite precursor. When it is used only as a solvent, it will lead to rapid crystallization of PbI2 or perovskite, and a poor-quality perovskite film will be formed, which severely affects the efficiency of the PSCs. To solve this problem, researchers have done a lot of outstanding work. In 2014, Han et al. and Seok et al. used the strongly coordinative solvent DMSO as solvent or as additive in PbI2 or a perovskite precursor to obtain a highly uniform perovskite film with no residual PbI2 owing to the formation of a PbI2–DMSO complex [49,50]. In 2017, You et al. added 5% volume of DMSO solvent in DMF as a mixture solvent for dissolving PbI2 beads. The obtained PbI2 layer with DMSO additive is dense and smooth, the morphology of the formed perovskite layer has also been improved, and an efficiency of 20.1% in 1cm2 has been achieved by using the two-step spin-coating fabrication method [18]. When larger-area PSCs are prepared by other methods, at very fast ablation speeds and lower deposition temperatures (room temperature), and when DMF or DMSO is used as the perovskite solvent, the perovskite ink does not dry immediately. In order to accelerate the drying of the liquid layer at room temperature, Huang and co-workers introduce about 2% VNCS into the perovskite ink. The VNCS under N2-knife-assisted blade coating and a mild annealing process gives more time and a lower energy barrier for the perovskite crystalline grains to grow into large sizes and form good contact to the substrate (Fig. 9). By using this method of preparing PSCs, a certified efficiency of 16.4% with an aperture area of 63.7cm2 was achieved [29].

 

Fig. 9. SEM images of (a) surfaces and (b) cross-sections of perovskite films prepared with different solvents, respectively. Reproduced with permission [29], Copyright 2018, American Association for the Advancement of Science.

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B. Additives Engineering

The manufacture of large-area, high-quality, and uniform perovskite films is the main bottleneck for large-area PSCs. In the past decade, there have been a large number of methods for manufacturing large-area perovskite films. Among these methods, the introduction of additives into perovskite precursors has proven to be an effective method for manufacturing large-area and high-quality perovskite films.

1. Organic Halide Ammonium Salts as Additives

Organic halide ammonuim salts (OHAS), both CH3NH3 (MA) based and HC(NH2)2 (FA) based, are the materials that are mostly widely used to improve the morphology of perovskite. Among these OHAS, MACl is considered to be one of the most effective and widely used additives for growth of high-quality perovskite for both small-area and large-area PSCs.

For example, in 2016, Marks and co-workers reported a hot-casting process with controlled Cl incorporation that achieves high stability and a high PCE of 15.4% for large-area (1cm2) single-cell PSC. The enhanced performance can be attributed to the longer carrier diffusion length, the more uniform morphology of perovskite films, the improved perovskite crystallite orientation, and the reduced carrier recombination through the introduction of chloride ions [Fig. 10(a)] [51]. In 2017, Zhu and co-workers used excessive amounts of MACl in perovskite ink, which not only increased the grain size of the perovskite and the crystallinity of the film but also increased the grain growth rate of the perovskite [Fig. 10(b)]. It also significantly reduces thermal annealing requirements. The absorbing layer was prepared by doctor-blade coating. Finally, the average efficiencies of the devices with areas of 1.2cm2 and 12.6cm2 were 17.33% and 13.3%, respectively [52]. Qi and co-workers introduced MACl into the fast gas-solid reaction of hydrogen lead triiodide [HPbI3(Cl)] and CH3NH2 gas to fabricate high-quality perovskite films with a thickness of more than 1 μm. The introduction of MACl can not only achieve a small amount of substitution of iodine ions with chlorine ions but also can adjust the morphology of HPbI3 (Cl) films. Finally, a PCE of 15.3% for 5cm×5cm solar modules was achieved [Fig. 10(c)] [53].

When preparing large-area PSCs, MAPbI3 is usually the main component of the perovskite layer. In 2015, Zhu et al. found that excess MAI in the perovskite precursor solution also played a positive role in the devices [Fig. 10(d)]. They found that when the excess MAI is absent, the grain size is typically limited to a few hundred nanometers. But when excess MAI is present, it compensates for the loss of any MAI and suppresses (or delays) the formation of a PbI2 phase during annealing. Using this crystallization-coarsening two-step approach with the nonstoichiometric MAPbI3 precursor solution, the best PCE of 16.3% was achieved for a planar PSC with 1.2cm2 active area [54].

2. Inorganic Halide as Additives

In addition to the above-mentioned OHAS as additives that can improve the quality of perovskite films, some inorganic halides are also used as additives into the perovskite to obtain higher-quality perovskite films and improve the PCE of large-area PSCs.

For example, Qiu and co-workers obtained a pinhole-free, highly crystallized perovskite film by introducing PbCl2 into the perovskite precursor and using the one-step spin-coating method followed by thermal annealing for 10 min [Figs. 11(a)11(d)]. It can be seen from Fig. 11(e) that when 20%–30% PbCl2 is added to the perovskite precursor solution, the pinholes of the perovskite films are the smallest. The high-quality perovskite thin film enables the perovskite module with an area of 4cm2 to obtain a PCE of 13.6% [55]. The KI was also introduced into the perovskite precursor by Zhong and co-workers. The incorporation of KI strongly promotes the crystallization of the perovskite film, and its grain size is as high as 1μm [Figs. 11(f)11(i)], which has doubled compared with those without KI. Perovskite with less interface defect density, longer carrier lifetime, and faster charge transportation was obtained. Finally, a 36cm2 submodule with the KxCs0.05(FA0.85MA0.15)0.95Pb(I0.85Br0.15)3 (KCsFAMA) composition achieved a high PCE of 15.76% without any hysteresis [56]. In 2019, Qi and co-workers used CsBr additives in FA cationic perovskite manufacturing based on a hybrid chemical vapor deposition (HCVD) process. They achieved a PCE of nearly 10%, and their cell area was 91.8cm2 (14 cells in series) [Figs. 11(j) and 11(k)] [57].

 

Fig. 10. (a) Morphological characterization of perovskite MAPbI3 films with different amounts of Cl incorporation by optical microscopy (top row), SEM (middle row), and atomic force microscope (AFM) (bottom row). (b) Top-view SEM images of perovskite films prepared with different excess amounts of MACl using blade-coating (top row) and spin-coating (bottom row) methods. (c) Photograph of the 1.1 μm thick MAPbI3 (Cl) film on a 5cm×5cm substrate, 12.0cm2 six-cell perovskite solar module, and J–V curve of the 5cm×5cm perovskite module with an active area of 12.0cm2. (d) Schematic illustration of perovskite film nucleation/crystallization from solvent bathing. (a) Reproduced with permission [51], Copyright 2016, Wiley. (b) Reproduced with permission [52], Copyright 2017, Nature Publishing Group. (c) Reproduced with permission [53], Copyright 2018, Nature Publishing Group. (d) Reproduced with permission [54], Copyright 2015, Wiley.

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Fig. 11. (a)–(d) Top-view SEM images of perovskite films made with different amounts PbCl2 in the mixed lead source. (e) The crystal grain size and pinhole area in the perovskite films as a function of PbCl2 fraction. (f) XRD patterns and UV-Vis spectra, and (g)–(i) SEM images of FAMA/CsFAMA/KCsFAMA perovskite films, respectively. (j) Optical image of a 10cm×10cm HCVD Cs0.1FA0.9PbI2.9Br0.1-based solar module. (k) J-V curve of the champion solar module (14 subcells in series). (a)–(e) Reproduced with permission [55], Copyright 2016, Royal Society of Chemistry. (f)–(i) Reproduced with permission [56], Copyright 2017, Royal Society of Chemistry. (j) and (k) Reproduced with permission [57], Copyright 2019, Royal Society of Chemistry.

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3. Other Additives

To fabricate high-efficiency large-area PSCs and solar modules, depositing smooth and uniform perovskite film with full coverage on the substrate is necessary. Huang and co-workers added a small amount L-α-phosphatidylcholine to the MAPbI3/DMF precursor solution and deposited perovskite films via the blade-coating method. They found that the L-α-phosphatidylcholine not only suppressed solution flow but also improved the wettability of the perovskite ink. Through surfactant additive engineering, the authors demonstrated that smooth perovskite films with 14.5 nm root-mean-square roughness could be quickly deposited by the blade-coating method. Their blade-coated perovskite solar module showed stabilized efficiencies of 15.3% (33.0cm2) and 14.6% (57.2cm2), respectively [21].

In 2014, Jen et al. introduced 1% (mass fraction) 1,8-diiodooctane (DIO) into perovskite precursor solution. The surface of the perovskite films is more continuous and smoother than that obtained from the pristine solution [58]. DIO was also used as an additive to control the growth of perovskite solar modules by Fu et al., and a PCE of 11.2% with an active area over 12cm2 was obtained [59].

In addition to the additives mentioned above, some large organic cations and 2D materials have also been introduced as additives in the preparation of large-area high-quality perovskites, which can not only improve the quality of perovskite layer but also improve the stability of perovskites [6063]. In 2019, Xing et al. found that tert-butylammonium (t-BA) in the perovskite precursor solution also played a positive role in the devices, which could not only improve the quality of the perovskite film and increase the carrier diffusion length but also increase the perovskite’s stability. By adding t-BA to the perovskite precursor solution, they obtained high-performance PSCs with a champion PCE of 14.54% for area of 20.8cm2 [61]. In 2020, the 2D C6H18N2O2PbI4 (EDBEPbI4) was introduced into the precursor solution of perovskite, and the grain boundaries of the deposited 3D perovskite film were vertically passivated with phase-pure 2D perovskite, thereby obtaining a perovskite light-absorbing layer with larger grains and higher stability. By introduction of EDBEPbI4, the PCE of the device has reached 11.59% with an active area of 342cm2 [63].

4. FABRICATION OF LARGE-AREA CHARGE TRANSPORTING LAYERS

PSCs are composed of many layers stacked together, including metal electrodes, CTLs, and perovskite layers. As with the preparation of large-area perovskite light-absorbing layers, in addition to spin coating and blade coating, etc., electron beam (E-beam) deposition and chemical bath deposition (CBD) methods are also applied to perovskite solar cells in order to prepare a larger-area, continuous, and high-quality carrier transport layer [6467]. Many CTLs for small-area PSCs are also used to prepare large-area PSCs, such as TiO2 [16,52,68,69], SnO2 [17,70,71], PCBM [28,33,36], NiO [72,73], Spiro-OMeTAD [17,30,34,35,44,45], and PTAA [37]. In this section, we briefly summarize the other works on CTLs in PSCs.

In 2015, Han and co-workers prepared efficient and stable large-area PSCs with inorganic CTLs, and they obtained a PCE beyond 15% with an area beyond 1cm2 [Fig. 12(b)]. They used p-doped (p+) NixMg1-xO and n-doped (n+) TiOx contacts to selectively extract charge carriers from inverted PSCs. They implemented the p+ and n+ doping by substituting Ni(Mg)2+ ions and Ti4+ ions on the NixMg1-xO lattice and TiOx matrix by Li+ and Nb5+ ions, respectively [Fig. 12(a)]. The PSCs with the inorganic CTLs were stable: beyond 90% of the initial PCE was maintained after 1000 hours of light soaking [19].

 

Fig. 12. (a) Scheme of the cell configuration highlighting the doped charge carrier extraction layers. (b) J–V curve of the best large cell endowed with antireflection film. (c) Comparison of the Bifluo-OMeTAD molecule (upper) and Spiro-OMeTAD (Merck) molecule. (d) J-V curve of PSCs with HTLs Bifluo-OMeTAD and Spiro-OMeTAD. (e) The structure of using P3HT as the HTL and structure of the interface between the P3HT and WBH. (f) I-V curves of solar modules formed by depositing the P3HT layer using bar-coating (purple) and spin-coating (orange) methods. (g) The DFT simulation of GO and Cl-GO. (h) PL spectra and TRPL spectra for different films. (a) and (b) Reproduced with permission [19], Copyright 2017, Wiley. (c) and (d) Reproduced with permission [74], Copyright 2017, Nature Publishing Group. (e) and (f) Reproduced with permission [75], Copyright 2019, Nature Publishing Group. (g) and (h) Reproduced with permission [76], Copyright 2019, American Association for the Advancement of Science.

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Spiro-OMeTAD is an excellent HTL in the small-area PSCs, while using it in large-area PSCs by the slot-die coating technology will cause a significant decrease in performance due to crystallization. In this regard, Cheng and co-workers designed a new HTL (Bifluo-OMeTAD) [Fig. 12(c)]. This molecular arrangement could suppress crystallization during deposition, and a PCE of 14.7% was achieved with the Bifluo-OMeTAD as the HTL, which is higher than that of the devices based on Spiro-OMeTAD as the HTL [Fig. 12(d)] [74]. In addition to the HTLs of Spiro-OMeTAD and PTAA, P3HT is also used in large-area PSCs, and some progress has been made. Vak and co-workers used P3HT as the HTL through slot-die coating technology, and they obtained a PCE of 11.94% for PSCs in 2015 [32]. Despite the potential advantages of P3HT, the open circuit voltage (Voc) of the resulting device is lower due to the nonradiative recombination that occurs at the perovskite/P3HT interface. At the same time, the electronic coupling between the perovskite and P3HT molecule will also result in low electrical coupling. To address these issues, Seo et al. applied an ultrathin wide-bandgap halide (WBH) perovskite layer on top of the narrow-bandgap light-absorbing layer [(Fig. 12(e)]. The purpose of adding the WBH layer in the perovskite/P3HT interface is to effectively reduce recombination. They found that when P3HT is deposited on the surface of the WBH, interdigitation of its alkyl chains and the analogous alkyl chains of n-hexyltrimethyl ammonium bromide (C6H13-) should promote the self-assembly of P3HT. By this method, an average PCE of 16.0% was obtained for large-area module (24.97cm2) PSCs [Fig. 12(f)] [75].

Han and co-workers also introduced a chlorinated graphene oxide (Cl-GO) layer between the perovskite and the HTL. The heterostructure consists of a Pb-rich perovskite film and a Cl-GO layer, forming strong Pb-Cl and P-O bonds to connect the two layers. They compared the perovskite/PTAA with the perovskite/GO/PTAA samples; the perovskite/Cl-GO/PTAA sample exhibited the lowest steady-state photoluminescence (PL) signal, consistent with transient photoluminescence (TRPL) results. The results indicated that reduced charge recombination and more efficient charge extraction occurred in the perovskite/Cl-GO/PTAA heterostructure [Figs. 12(g) and 12(h)]. The PCE of PSCs with an aperture area of 1.02cm2 was about 21% [76].

5. OUTLOOK AND SUMMARY

In this review, we have summarized recent progress in large-area perovskite solar cells, including the perovskite film deposition method and also how to control the growth of large-area, high-quality perovskite films and charge transport layers. Although there is significant progress in large-area perovskite solar cells, and the efficiency has been beyond 18% and 16% for around 20cm2 and 800cm2, respectively, there is still a certain efficiency gap between the large and small size. Therefore, it is still important to improve the PCE of PSCs for large-area devices. We believe the perovskite film itself is critical for delivering high efficiency of large-area PSCs, and there could be three directions. (i) The first approach should be the most important: we need to find a deposition method and also a perfect precursor for deposition of large crystal perovskite films, free of cracks and pinholes, that reduces the bulk defect recombination. (ii) Composition engineering: most of the works on large-area PSCs are focused on MAPbI3 with a large bandgap, and we should adjust the perovskite bandgap to be smaller. (iii) The third approach is interface modification, which reduces interface defects and the charge recombination; in addition, the electrical contact is also important.

In addition to improving the PCE of PSCs, for commercial development of PSCs, the stability is another challenge that urgently needs to be addressed. The longest lifetime reported for small-area PSCs is about one year [77], which is much shorter than the 25 years of commercialized PV technologies [50]. Besides, while enlarging the device area, the lateral contact between metal and perovskite could reduce the lifetime. Factors affecting the stability of PSCs include: the unstable chemical composition of perovskite; the charge transport material and interfacial degradation; metal electrodes suffering from corrosion by ion migration in perovskite; and the external environment, such as water, oxygen, heat, and light. The hygroscopicity of PSCs can be solved by encapsulation technology. It is necessary to adjust the composition, reduce defects, and select an HTL with high carrier mobility and conductivity to solve the problems of PSCs’ thermal instability and ion migration. On the other hand, the ion migration is almost unavoidable in PSCs, and the situation is worse at the defective sites, grain boundaries, and the interfaces of the PSCs [50]. Unlike small-area PSCs, currently, in large-area PSC modules, the passivation layer is rarely used to passivate surface defects on the perovskite surface. As a result, a kind of passivation film that can form a large, uniform area and passivate the surface of the perovskite should be developed and then used to improve the performance of the modules. We believe that we can obtain more high-performance and stable, large-area PSCs by optimizing the preparation method for large-area modules, growing high-quality perovskite thin films, reducing the number of carrier recombination centers in the devices, and choosing the appropriate CTLs.

Funding

China National Funds for Distinguished Young Scientists (61925405).

Disclosures

The authors declare no conflicts of interest.

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57. L. Qiu, S. He, Y. Jiang, D.-Y. Son, L. K. Ono, Z. Liu, T. Kim, T. Bouloumis, S. Kazaoui, and Y. Qi, “Hybrid chemical vapor deposition enables scalable and stable Cs-FA mixed cation perovskite solar modules with a designated area of 91.8 cm2 approaching 10% efficiency,” J. Mater. Chem. A 7, 6920–6929 (2019). [CrossRef]  

58. P.-W. Liang, C.-Y. Liao, C.-C. Chueh, F. Zuo, S. T. Williams, X.-K. Xin, J. Lin, and A. K.-Y. Jen, “Additive enhanced crystallization of solution-processed perovskite for highly efficient planar-heterojunction solar cells,” Adv. Mater. 26, 3748–3754 (2014). [CrossRef]  

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72. G. Li, Y. Jiang, S. Deng, A. Tam, P. Xu, M. Wong, and H.-S. Kwok, “Overcoming the limitations of sputtered nickel oxide for high-efficiency and large-area perovskite solar cells,” Adv. Sci. 4, 1700463 (2017). [CrossRef]  

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2020 (2)

M. A. Green, E. D. Dunlop, J. H. Ebinger, M. Yoshita, N. Kopidakis, and A. W. Y. Ho-Baillie, “Solar cell efficiency tables (version 55),” Prog. Photovolt. Res. Appl. 28, 3–15 (2020).
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C. Liang, K. M. Muhammed Salim, P. Li, Z. Wang, T. M. Koh, H. Gu, B. Wu, J. Xia, Z. Zhang, K. Wang, T. Liu, Q. Wei, S. Wang, Y. Tang, G. Shao, Y. Song, N. Mathews, and G. Xing, “Controlling films structure by regulating 2D Ruddlesden-Popper perovskite formation enthalpy for efficient and stable tri-cation perovskite solar cells,” J. Mater. Chem. A 8, 5874–5881 (2020).

2019 (17)

L. Qiu, S. He, Y. Jiang, D.-Y. Son, L. K. Ono, Z. Liu, T. Kim, T. Bouloumis, S. Kazaoui, and Y. Qi, “Hybrid chemical vapor deposition enables scalable and stable Cs-FA mixed cation perovskite solar modules with a designated area of 91.8 cm2 approaching 10% efficiency,” J. Mater. Chem. A 7, 6920–6929 (2019).
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C. Liang, D. Zhao, P. Li, B. Wu, H. Gu, J. Zhang, T. W. Goh, S. Chen, Y. Chen, Z. Sha, G. Shao, T. C. Sumb, and G. Xing, “Simultaneously boost diffusion length and stability of perovskite for high performance solar cells,” Nano Energy 59, 721–729 (2019).
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X. Ren, L. Xie, W. B. Kim, D. G. Lee, H. S. Jung, and S. F. Liu, “Chemical bath deposition of co-doped TiO2 electron transport layer for hysteresis-suppressed high-efficiency planar perovskite solar cells,” Sol. RRL 3, 1900176 (2019).
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L. Qiu, Z. Liu, L. K. Ono, Y. Jiang, D.-Y. Son, Z. Hawash, S. He, and Y. Qi, “Scalable fabrication of stable high efficiency perovskite solar cells and modules utilizing room temperature sputtered SnO2 electron transport layer,” Adv. Funct. Mater. 29, 1806779 (2019).
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S. K. Karunakaran, G. M. Arumugam, W. Yang, S. Ge, S. N. Khan, X. Lin, and G. Yang, “Recent progress in inkjet-printed solar cells,” J. Mater. Chem. A 7, 13873–13902 (2019).
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J.-E. Kim, S.-S. Kim, C. Zuo, M. Gao, D. Vak, and D.-Y. Kim, “Humidity-tolerant roll-to-roll fabrication of perovskite solar cells via polymer-additive- assisted hot slot die deposition,” Adv. Funct. Mater. 29, 1809194 (2019).
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Y. Y. Kim, T.-Y. Yang, R. Suhonen, M. Välimäki, T. Maaninen, A. Kemppainen, N. J. Jeon, and J. Seo, “Gravure-printed flexible perovskite solar cells: toward roll-to-roll manufacturing,” Adv. Sci. 6, 1802094 (2019).
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Y. Zhao, Q. Ye, Z. Chu, F. Gao, X. Zhang, and J. You, “Recent progress in high-efficiency planar-structure perovskite solar cells,” Energy Environ. Mater. 2, 93–106 (2019).
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H. S. Jung, G. S. Han, N.-G. Park, and M. J. Ko, “Flexible perovskite solar cells,” Joule 3, 1850–1880 (2019).
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Y. Deng, C. H. V. Brackle, X. Dai, J. Zhao, B. Chen, and J. Huang, “Tailoring solvent coordination for high-speed, room-temperature blading of perovskite photovoltaic films,” Sci. Adv. 5, eaax7537 (2019).
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Q. Jiang, Y. Zhao, X. Zhang, X. Yang, Y. Chen, Z. Chu, Q. Ye, X. Li, Z. Yin, and J. You, “Surface passivation of perovskite film for efficient solar cells,” Nat. Photonics 13, 460–466 (2019).
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Q. Ye, Y. Zhao, S. Mu, P. Gao, X. Zhang, and J. You, “Stabilizing the black phase of cesium lead halide inorganic perovskite for efficient solar cells,” Sci. China Chem. 62, 810–821 (2019).
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F. Gao, Y. Zhao, X. Zhang, and J. You, “Recent progresses on defect passivation toward efficient perovskite solar cells,” Adv. Energy Mater. 10, 1902650 (2019).
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N.-G. Park, “Research direction toward scalable, stable, and high efficiency perovskite solar cells,” Adv. Energy Mater. 10, 1903106 (2019).
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B. Cao, L. Yang, S. Jiang, H. Lin, N. Wang, and X. Li, “Flexible quintuple cation perovskite solar cells with high efficiency,” J. Mater. Chem. A 7, 4960–4970 (2019).
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E. H. Jung, N. J. Jeon, E. Y. Park, C. S. Moon, T. J. Shin, T.-Y. Yang, J. H. Noh, and J. Seo, “Efficient, stable and scalable perovskite solar cells using poly(3-hexylthiophene),” Nature 567, 511–515 (2019).
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Y. Wang, T. Wu, J. Barbaud, W. Kong, D. Cui, H. Chen, X. Yang, and L. Han, “Stabilizing heterostructures of soft perovskite semiconductors,” Science 365, 687–691 (2019).
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2018 (19)

W. Chen, Y. Wu, J. Fan, A. B. Djurišić, F. Liu, H. W. Tam, A. Ng, C. Surya, W. K. Chan, D. Wang, and Z.-B. He, “Understanding the doping effect on NiO: toward high-performance inverted perovskite solar cells,” Adv. Energy Mater. 8, 1703519 (2018).
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T. Bu, J. Li, F. Zheng, W. Chen, X. Wen, Z. Ku, Y. Peng, J. Zhong, Y.-B. Cheng, and F. Huang, “Universal passivation strategy to slot-die printed SnO2 for hysteresis-free efficient flexible perovskite solar module,” Nat. Commun. 9, 4609 (2018).
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J.-W. Lee, D.-K. Lee, D.-N. Jeong, and N.-G. Park, “Control of crystal growth toward scalable fabrication of perovskite solar cells,” Adv. Funct. Mater. 29, 1807047 (2018).
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D. H. Kim, J. B. Whitaker, Z. Li, M. F. A. M. van Hest, and K. Zhu, “Outlook and challenges of perovskite solar cells toward terawatt-scale photovoltaic module technology,” Joule 2, 1437–1451 (2018).
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J. B. Whitaker, D. H. Kim, B. W. Larson, F. Zhang, J. J. Berry, M. F. A. M. van Hest, and K. Zhu, “Scalable slot-die coating of high performance perovskite solar cells,” Sustain. Energy Fuels 2, 2442–2449 (2018).
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Y. Deng, X. Zheng, Y. Bai, Q. Wang, J. Zhao, and J. Huang, “Surfactant-controlled ink drying enables high-speed deposition of perovskite films for efficient photovoltaic modules,” Nat. Energy 3, 560–566 (2018).
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Y. Chen, L. Zhang, Y. Zhang, H. Gao, and H. Yan, “Large-area perovskite solar cells – a review of recent progress and issues,” RSC Adv. 8, 10489–10508 (2018).
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C. Zuo, D. Vak, D. Angmo, L. Ding, and M. Gao, “One-step roll-to-roll air processed high efficiency perovskite solar cells,” Nano Energy 46, 185–192 (2018).
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F. D. Giacomo, S. Shanmugam, H. Fledderus, B. J. Bruijnaers, W. J. Verhees, M. S. Dorenkamper, S. C. Veenstra, W. Qiu, R. Gehlhaar, and T. Merckx, “Up-scalable sheet-to-sheet production of high efficiency perovskite module and solar cells on 6-in. substrate using slot die coating,” Sol. Energy Mater. Sol. Cells 181, 53–59 (2018).
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N. Jeon, H. Na, E. Jung, T.-Y. Yang, Y. Lee, G. Kim, H.-W. Shin, S. Seok, J. Lee, and J. Seo, “A fluorene-terminated hole-transporting material for highly efficient and stable perovskite solar cells,” Nat. Energy 3, 682–689 (2018).
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M. Park, W. Cho, G. Lee, S. C. Hong, M.-C. Kim, J. Yoon, N. Ahn, and M. Choi, “Highly reproducible large-area perovskite solar cell fabrication via continuous megasonic spray coating of CH3NH3PbI3,” Small 15, 1804005 (2018).
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Z. Liu, L. Qiu, E. J. J. Perez, Z. Hawash, T. Kim, Y. Jiang, Z. Wu, S. R. Raga, L. K. Ono, S. F. Liu, and Y. Qi, “Gas-solid reaction based over one-micrometer thick stable perovskite films for efficient solar cells and modules,” Nat. Commun. 9, 3880 (2018).
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Y. Rong, Y. Hu, A. Mei, H. Tan, M. I. Saidaminov, S. Il Seok, M. D. McGehee, E. H. Sargent, and H. Han, “Challenges for commercializing perovskite solar cells,” Science 361, eaat8235 (2018).
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C. Liang, P. Li, H. Gu, Y. Zhang, F. Li, Y. Song, G. Shao, N. Mathews, and G. Xing, “One-step inkjet printed perovskite in air for efficient light harvesting,” Sol. RRL 2, 1700217 (2018).
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P. Li, C. Liang, B. Bao, Y. Li, X. Hu, Y. Wang, Y. Zhang, F. Li, G. Shao, and Y. Song, “Inkjet manipulated homogeneous large size perovskite grains for efficient and large-area perovskite solar cells,” Nano Energy 46, 203–211 (2018).
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B. Dou, J. B. Whitaker, K. Bruening, D. T. Moore, L. M. Wheeler, J. Ryter, N. J. Breslin, J. J. Berry, S. M. Garner, and F. Barnes, “Roll-to-roll printing of perovskite solar cells,” ACS Energy Lett. 3, 2558–2565 (2018).
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J. Sun, J. Lu, B. Li, L. Jiang, A. S. R. Chesman, A. D. Scully, T. R. Gengenbach, Y.-B. Cheng, and J. J. Jasieniak, “Inverted perovskite solar cells with high fill-factors featuring chemical bath deposited mesoporous NiO hole transporting layers,” Nano Energy 49, 163–171 (2018).
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C. Liang, D. Zhao, Y. Li, X. Li, S. Peng, G. Shao, and G. Xing, “Ruddlesden–Popper perovskite for stable solar cells,” Energy Environ. Mater. 1, 221–231 (2018).
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P. Li, Y. Zhang, C. Liang, G. Xing, X. Liu, F. Li, X. Liu, X. Hu, G. Shao, and Y. Song, “Phase pure 2D perovskite for high-performance 2D-3D heterostructured perovskite solar cells,” Adv. Mater. 30, 1805323 (2018).
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2017 (14)

J. Feng, Z. Yang, D. Yang, X. Ren, X. Zhu, Z. Jin, W. Zi, Q. Wei, and S. F. Liu, “E-beam evaporated Nb2O5 as an effective electron transport layer for large flexible perovskite solar cells,” Nano Energy 36, 1–8 (2017).
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C. Liang, Z. Wu, P. Li, J. Fan, Y. Zhang, and G. Shao, “Making high-quality CTLs is as important as making high-quality perovskite films to achieve efficient and stable PSCs,” Appl. Surf. Sci. 391, 337–341 (2017).
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G. Fu, L. Hou, Y. Wang, X. Liu, J. Wang, H. Li, Y. Cui, D. Liu, X. Li, and S. Yang, “Efficiency enhancement in planar CH3NH3PbI3–xClx perovskite solar cells by processing with bidentate halogenated additives,” Sol. Energy Mater. Sol. Cells 165, 36–44 (2017).
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Y. Hu, S. Si, A. Mei, Y. Rong, H. Liu, X. Li, and H. Han, “Stable large-area (10 × 10  cm2) printable mesoscopic perovskite module exceeding 10% efficiency,” Sol. RRL 1, 1600019 (2017).
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G. Li, Y. Jiang, S. Deng, A. Tam, P. Xu, M. Wong, and H.-S. Kwok, “Overcoming the limitations of sputtered nickel oxide for high-efficiency and large-area perovskite solar cells,” Adv. Sci. 4, 1700463 (2017).
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T. Bu, X. Liu, Y. Zhou, J. Yi, X. Huang, L. Luo, J. Xiao, Z. Ku, Y. Peng, F. Huang, Y.-B. Cheng, and J. Zhong, “Novel quadruple-cation absorber for universal hysteresis elimination for high efficiency and stable perovskite solar cells,” Energy Environ. Sci. 10, 2509–2515 (2017).
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H.-C. Liao, P. Guo, C.-P. Hsu, M. Lin, B. Wang, L. Zeng, W. Huang, C. M. M. Soe, W.-F. Su, M. J. Bedzyk, M. R. Wasielewski, A. Facchetti, R. P. H. Chang, M. G. Kanatzidis, and T. J. Marks, “Enhanced efficiency of hot-cast large-area planar perovskite solar cells/modules having controlled chloride incorporation,” Adv. Energy Mater. 7, 1601660 (2017).
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M. Yang, Z. Li, M. O. Reese, O. G. Reid, D. H. Kim, S. Siol, T. R. Klein, Y. Yan, J. J. Berry, M. F. A. M. van Hest, and K. Zhu, “Perovskite ink with wide processing window for scalable high-efficiency solar cells,” Nat. Energy 2, 17038 (2017).
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H. Chen, F. Ye, W. Tang, J. He, M. Yin, Y. Wang, F. Xie, E. Bi, X. Yang, M. Grätzel, and L. Han, “A solvent- and vacuum-free route to large-area perovskite films for efficient solar modules,” Nature 550, 92–95 (2017).
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W. S. Yang, B.-W. Park, E. H. Jung, N. J. Jeon, Y. C. Kim, D. Uk Lee, S. S. Shin, J. Seo, E. K. Kim, J. H. Noh, and S. Il Seok, “Iodide management in formamidinium-lead-halide-based perovskite layers for efficient solar cells,” Science 356, 1376–1379 (2017).
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H. Tan, A. Jain, O. Voznyy, X. Lan, F. P. G. de Arquer, J. Z. Fan, R. Q. Bermudez, M. Yuan, B. Zhang, Y. Zhao, F. Fan, P. Li, L. N. Quan, Y. Zhao, Z.-H. Lu, Z. Yang, S. Hoogland, and E. H. Sargent, “Efficient and stable solution-processed planar perovskite solar cells via contact passivation,” Science 355, 722–726 (2017).
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Q. Jiang, Z. Chu, P. Wang, X. Yang, H. Liu, Y. Wang, Z. Yin, J. Wu, X. Zhang, and J. You, “Planar-structure perovskite solar cells with efficiency beyond 21%,” Adv. Mater. 29, 1703852 (2017).
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T. Qin, W. Huang, J.-E. Kim, D. Vak, C. Forsyth, C. R. McNeill, and Y.-B. Cheng, “Amorphous hole-transporting layer in slot-die coated perovskite solar cells,” Nano Energy 31, 210–217 (2017).
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G. Grancini, C. Roldán-Carmona, I. Zimmermann, E. Mosconi, X. Lee, D. Martineau, S. Narbey, F. Oswald, F. De Angelis, M. Graetzel, and M. K. Nazeeruddin, “One-year stable perovskite solar cells by 2D/3D interface engineering,” Nat. Commun. 8, 15684 (2017).
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2016 (6)

D. Bi, C. Yi, J. Luo, J. D. Decoppet, F. Zhang, S. Zakeeruddin, X. Li, A. Hagfeldt, and M. Gratzel, “Polymer-templated nucleation and crystal growth of perovskite films for solar cells with efficiency greater than 21%,” Nat. Energy 1, 16142 (2016).
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J. G. Tait, S. Manghooli, W. Qiu, L. Rakocevic, L. Kootstra, M. Jaysankar, C. A. Massede la Huerta, U. W. Paetzold, R. Gehlhaar, D. Cheyns, P. Heremans, and J. Poortmans, “Rapid composition screening for perovskite photovoltaics via concurrently pumped ultrasonic spray coating,” J. Mater. Chem. A 4, 3792–3797 (2016).
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W. Qiu, T. Merckx, M. Jaysankar, C. Masse de la Huerta, L. Rakocevic, W. Zhang, U. W. Paetzold, R. Gehlhaar, L. Froyen, J. Poortmans, D. Cheyns, H. J. Snaith, and P. Heremans, “Pinhole-free perovskite films for efficient solar modules,” Energy Environ. Sci. 9, 484–489 (2016).
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A. Priyadarshi, L. J. Haur, P. Murray, D. Fu, S. Kulkarni, G. Xing, T. C. Sum, N. Mathews, and S. G. Mhaisalkar, “A large area (70 cm2) monolithic perovskite solar module with a high efficiency and stability,” Energy Environ. Sci. 9, 3687–3692 (2016).
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J. H. Heo, M. H. Lee, M. H. Jang, and S. H. Im, “Highly efficient CH3NH3PbI3-xClx mixed halide perovskite solar cells prepared by re-dissolution and crystal grain growth via spray coating,” J. Mater. Chem. A 4, 17636–17642 (2016).
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X. Li, D. Bi, C. Yi, J.-D. Décoppet, J. Luo, S. M. Zakeeruddin, A. Hagfeldt, and M. Grätzel, “A vacuum flash-assisted solution process for high-efficiency large-area perovskite solar cells,” Science 353, 58–62 (2016).
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2015 (7)

M. Yang, Y. Zhou, Y. Zeng, C.-S. Jiang, N. P. Padture, and K. Zhu, “Square-centimeter solution-processed planar CH3NH3PbI3 perovskite solar cells with efficiency exceeding 15%,” Adv. Mater. 27, 6363–6370 (2015).
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K. Hwang, Y.-S. Jung, Y.-J. Heo, F. H. Scholes, S. E. Watkins, J. Subbiah, D. J. Jones, D.-Y. Kim, and D. Vak, “Toward large scale roll-to-roll production of fully printed perovskite solar cells,” Adv. Mater. 27, 1241–1247 (2015).
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N. J. Jeon, J. H. Noh, W. S. Yang, Y. C. Kim, S. Ryu, J. Seo, and S. Il Seok, “Compositional engineering of perovskite materials for high-performance solar cells,” Nature 517, 476–480 (2015).
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Z. Yang, C.-C. Chueh, F. Zuo, J. H. Kim, P.-W. Liang, and A. K.-Y. Jen, “High-performance fully printable perovskite solar cells via blade-coating technique under the ambient condition,” Adv. Energy Mater. 5, 1500328 (2015).
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Y. Deng, E. Peng, Y. Shao, Z. Xiao, Q. Dong, and J. Huang, “Scalable fabrication of efficient organolead trihalide perovskite solar cells with doctor-bladed active layers,” Energy Environ. Sci. 8, 1544–1550 (2015).
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W. Chen, Y. Wu, Y. Yue, J. Liu, W. Zhang, X. Yang, H. Chen, E. Bi, I. Ashraful, M. Grätzel, and L. Han, “Efficient and stable large-area perovskite solar cells with inorganic charge extraction layers,” Science 350, 944–948 (2015).
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W. Yang, J. Noh, N. Jeon, Y. Kim, S. Ryu, J. Seo, and S. Seok, “High-performance photovoltaic perovskite layers fabricated through intramolecular exchange,” Science 348, 1234–1237 (2015).
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2014 (6)

D. Vak, K. Hwang, A. Faulks, Y.-S. Jung, N. Clark, D.-Y. Kim, G. J. Wilson, and S. E. Watkins, “3D printer based slot-die coater as a lab-to-fab translation tool for solution-processed solar cells,” Adv. Energy Mater. 5, 1401539 (2014).
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A. T. Barrows, A. J. Pearson, C. K. Kwak, A. D. F. Dunbar, A. R. Buckley, and D. G. Lidzey, “Efficient planar heterojunction mixed-halide perovskite solar cells deposited via spray-deposition,” Energy Environ. Sci. 7, 2944–2950 (2014).
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Y. Wu, A. Islam, X. Yang, C. Qin, J. Liu, K. Zhang, W. Peng, and L. Han, “Retarding the crystallization of PbI2 for highly reproducible planar-structured perovskite solar cells via sequential deposition,” Energy Environ. Sci. 7, 2934–2938 (2014).
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N. J. Jeon, J. H. Noh, Y. C. Kim, W. S. Yang, S. Ryu, and S. I. Seok, “Solvent engineering for high-performance inorganic-organic hybrid perovskite solar cells,” Nat. Mater. 13, 897–903 (2014).
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A. Mei, X. Li, L. Liu, Z. Ku, T. Liu, Y. Rong, M. Xu, M. Hu, J. Chen, Y. Yang, M. Grätzel, and H. Han, “A hole-conductor-free, fully printable mesoscopic perovskite solar cell with high stability,” Science 345, 295–298 (2014).
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P.-W. Liang, C.-Y. Liao, C.-C. Chueh, F. Zuo, S. T. Williams, X.-K. Xin, J. Lin, and A. K.-Y. Jen, “Additive enhanced crystallization of solution-processed perovskite for highly efficient planar-heterojunction solar cells,” Adv. Mater. 26, 3748–3754 (2014).
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2013 (1)

O. A. Basaran, H. Gao, and P. P. Bhat, “Nonstandard inkjets,” Annu. Rev. Fluid Mech. 45, 85–113 (2013).
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2012 (2)

H. Kim, C. Lee, J. H. Im, K. Lee, T. Moehl, A. Marchioro, S. Moon, R. Humphry-Baker, J. Yum, J. Moser, M. Gratzel, and N. Park, “Lead iodide perovskite sensitized all-solid-state submicron thin film mesoscopic solar cell with efficiency exceeding 9%,” Sci. Rep. 2, 591 (2012).
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M. M. Lee, J. Teuscher, T. Miyasaka, T. N. Murakami, and H. J. Snaith, “Efficient hybrid solar cells based on meso-superstructured organometal halide perovskites,” Science 338, 643–647 (2012).
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2009 (1)

K. Kojima, Y. Teshima, T. Shirai, and T. Miyasaka, “Organometal halide perovskites as visible-light sensitizers for photovoltaic cells,” J. Am. Chem. Soc. 131, 6050–6051 (2009).
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Ahn, N.

M. Park, W. Cho, G. Lee, S. C. Hong, M.-C. Kim, J. Yoon, N. Ahn, and M. Choi, “Highly reproducible large-area perovskite solar cell fabrication via continuous megasonic spray coating of CH3NH3PbI3,” Small 15, 1804005 (2018).
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Angmo, D.

C. Zuo, D. Vak, D. Angmo, L. Ding, and M. Gao, “One-step roll-to-roll air processed high efficiency perovskite solar cells,” Nano Energy 46, 185–192 (2018).
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X. Ren, L. Xie, W. B. Kim, D. G. Lee, H. S. Jung, and S. F. Liu, “Chemical bath deposition of co-doped TiO2 electron transport layer for hysteresis-suppressed high-efficiency planar perovskite solar cells,” Sol. RRL 3, 1900176 (2019).
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J. Sun, J. Lu, B. Li, L. Jiang, A. S. R. Chesman, A. D. Scully, T. R. Gengenbach, Y.-B. Cheng, and J. J. Jasieniak, “Inverted perovskite solar cells with high fill-factors featuring chemical bath deposited mesoporous NiO hole transporting layers,” Nano Energy 49, 163–171 (2018).
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T. Qin, W. Huang, J.-E. Kim, D. Vak, C. Forsyth, C. R. McNeill, and Y.-B. Cheng, “Amorphous hole-transporting layer in slot-die coated perovskite solar cells,” Nano Energy 31, 210–217 (2017).
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Nat. Commun. (3)

Z. Liu, L. Qiu, E. J. J. Perez, Z. Hawash, T. Kim, Y. Jiang, Z. Wu, S. R. Raga, L. K. Ono, S. F. Liu, and Y. Qi, “Gas-solid reaction based over one-micrometer thick stable perovskite films for efficient solar cells and modules,” Nat. Commun. 9, 3880 (2018).
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T. Bu, J. Li, F. Zheng, W. Chen, X. Wen, Z. Ku, Y. Peng, J. Zhong, Y.-B. Cheng, and F. Huang, “Universal passivation strategy to slot-die printed SnO2 for hysteresis-free efficient flexible perovskite solar module,” Nat. Commun. 9, 4609 (2018).
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G. Grancini, C. Roldán-Carmona, I. Zimmermann, E. Mosconi, X. Lee, D. Martineau, S. Narbey, F. Oswald, F. De Angelis, M. Graetzel, and M. K. Nazeeruddin, “One-year stable perovskite solar cells by 2D/3D interface engineering,” Nat. Commun. 8, 15684 (2017).
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Nat. Energy (4)

Y. Deng, X. Zheng, Y. Bai, Q. Wang, J. Zhao, and J. Huang, “Surfactant-controlled ink drying enables high-speed deposition of perovskite films for efficient photovoltaic modules,” Nat. Energy 3, 560–566 (2018).
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D. Bi, C. Yi, J. Luo, J. D. Decoppet, F. Zhang, S. Zakeeruddin, X. Li, A. Hagfeldt, and M. Gratzel, “Polymer-templated nucleation and crystal growth of perovskite films for solar cells with efficiency greater than 21%,” Nat. Energy 1, 16142 (2016).
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N. Jeon, H. Na, E. Jung, T.-Y. Yang, Y. Lee, G. Kim, H.-W. Shin, S. Seok, J. Lee, and J. Seo, “A fluorene-terminated hole-transporting material for highly efficient and stable perovskite solar cells,” Nat. Energy 3, 682–689 (2018).
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M. Yang, Z. Li, M. O. Reese, O. G. Reid, D. H. Kim, S. Siol, T. R. Klein, Y. Yan, J. J. Berry, M. F. A. M. van Hest, and K. Zhu, “Perovskite ink with wide processing window for scalable high-efficiency solar cells,” Nat. Energy 2, 17038 (2017).
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Nat. Mater. (1)

N. J. Jeon, J. H. Noh, Y. C. Kim, W. S. Yang, S. Ryu, and S. I. Seok, “Solvent engineering for high-performance inorganic-organic hybrid perovskite solar cells,” Nat. Mater. 13, 897–903 (2014).
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Nat. Photonics (1)

Q. Jiang, Y. Zhao, X. Zhang, X. Yang, Y. Chen, Z. Chu, Q. Ye, X. Li, Z. Yin, and J. You, “Surface passivation of perovskite film for efficient solar cells,” Nat. Photonics 13, 460–466 (2019).
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Nature (3)

H. Chen, F. Ye, W. Tang, J. He, M. Yin, Y. Wang, F. Xie, E. Bi, X. Yang, M. Grätzel, and L. Han, “A solvent- and vacuum-free route to large-area perovskite films for efficient solar modules,” Nature 550, 92–95 (2017).
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N. J. Jeon, J. H. Noh, W. S. Yang, Y. C. Kim, S. Ryu, J. Seo, and S. Il Seok, “Compositional engineering of perovskite materials for high-performance solar cells,” Nature 517, 476–480 (2015).
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E. H. Jung, N. J. Jeon, E. Y. Park, C. S. Moon, T. J. Shin, T.-Y. Yang, J. H. Noh, and J. Seo, “Efficient, stable and scalable perovskite solar cells using poly(3-hexylthiophene),” Nature 567, 511–515 (2019).
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Prog. Photovolt. Res. Appl. (1)

M. A. Green, E. D. Dunlop, J. H. Ebinger, M. Yoshita, N. Kopidakis, and A. W. Y. Ho-Baillie, “Solar cell efficiency tables (version 55),” Prog. Photovolt. Res. Appl. 28, 3–15 (2020).
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RSC Adv. (1)

Y. Chen, L. Zhang, Y. Zhang, H. Gao, and H. Yan, “Large-area perovskite solar cells – a review of recent progress and issues,” RSC Adv. 8, 10489–10508 (2018).
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Sci. Adv. (1)

Y. Deng, C. H. V. Brackle, X. Dai, J. Zhao, B. Chen, and J. Huang, “Tailoring solvent coordination for high-speed, room-temperature blading of perovskite photovoltaic films,” Sci. Adv. 5, eaax7537 (2019).
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Sci. China Chem. (1)

Q. Ye, Y. Zhao, S. Mu, P. Gao, X. Zhang, and J. You, “Stabilizing the black phase of cesium lead halide inorganic perovskite for efficient solar cells,” Sci. China Chem. 62, 810–821 (2019).
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Sci. Rep. (1)

H. Kim, C. Lee, J. H. Im, K. Lee, T. Moehl, A. Marchioro, S. Moon, R. Humphry-Baker, J. Yum, J. Moser, M. Gratzel, and N. Park, “Lead iodide perovskite sensitized all-solid-state submicron thin film mesoscopic solar cell with efficiency exceeding 9%,” Sci. Rep. 2, 591 (2012).
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Science (9)

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W. Yang, J. Noh, N. Jeon, Y. Kim, S. Ryu, J. Seo, and S. Seok, “High-performance photovoltaic perovskite layers fabricated through intramolecular exchange,” Science 348, 1234–1237 (2015).
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W. S. Yang, B.-W. Park, E. H. Jung, N. J. Jeon, Y. C. Kim, D. Uk Lee, S. S. Shin, J. Seo, E. K. Kim, J. H. Noh, and S. Il Seok, “Iodide management in formamidinium-lead-halide-based perovskite layers for efficient solar cells,” Science 356, 1376–1379 (2017).
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W. Chen, Y. Wu, Y. Yue, J. Liu, W. Zhang, X. Yang, H. Chen, E. Bi, I. Ashraful, M. Grätzel, and L. Han, “Efficient and stable large-area perovskite solar cells with inorganic charge extraction layers,” Science 350, 944–948 (2015).
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H. Tan, A. Jain, O. Voznyy, X. Lan, F. P. G. de Arquer, J. Z. Fan, R. Q. Bermudez, M. Yuan, B. Zhang, Y. Zhao, F. Fan, P. Li, L. N. Quan, Y. Zhao, Z.-H. Lu, Z. Yang, S. Hoogland, and E. H. Sargent, “Efficient and stable solution-processed planar perovskite solar cells via contact passivation,” Science 355, 722–726 (2017).
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Y. Wang, T. Wu, J. Barbaud, W. Kong, D. Cui, H. Chen, X. Yang, and L. Han, “Stabilizing heterostructures of soft perovskite semiconductors,” Science 365, 687–691 (2019).
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A. Mei, X. Li, L. Liu, Z. Ku, T. Liu, Y. Rong, M. Xu, M. Hu, J. Chen, Y. Yang, M. Grätzel, and H. Han, “A hole-conductor-free, fully printable mesoscopic perovskite solar cell with high stability,” Science 345, 295–298 (2014).
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X. Li, D. Bi, C. Yi, J.-D. Décoppet, J. Luo, S. M. Zakeeruddin, A. Hagfeldt, and M. Grätzel, “A vacuum flash-assisted solution process for high-efficiency large-area perovskite solar cells,” Science 353, 58–62 (2016).
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Y. Rong, Y. Hu, A. Mei, H. Tan, M. I. Saidaminov, S. Il Seok, M. D. McGehee, E. H. Sargent, and H. Han, “Challenges for commercializing perovskite solar cells,” Science 361, eaat8235 (2018).
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Small (1)

M. Park, W. Cho, G. Lee, S. C. Hong, M.-C. Kim, J. Yoon, N. Ahn, and M. Choi, “Highly reproducible large-area perovskite solar cell fabrication via continuous megasonic spray coating of CH3NH3PbI3,” Small 15, 1804005 (2018).
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Sol. Energy Mater. Sol. Cells (2)

F. D. Giacomo, S. Shanmugam, H. Fledderus, B. J. Bruijnaers, W. J. Verhees, M. S. Dorenkamper, S. C. Veenstra, W. Qiu, R. Gehlhaar, and T. Merckx, “Up-scalable sheet-to-sheet production of high efficiency perovskite module and solar cells on 6-in. substrate using slot die coating,” Sol. Energy Mater. Sol. Cells 181, 53–59 (2018).
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G. Fu, L. Hou, Y. Wang, X. Liu, J. Wang, H. Li, Y. Cui, D. Liu, X. Li, and S. Yang, “Efficiency enhancement in planar CH3NH3PbI3–xClx perovskite solar cells by processing with bidentate halogenated additives,” Sol. Energy Mater. Sol. Cells 165, 36–44 (2017).
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Sol. RRL (3)

Y. Hu, S. Si, A. Mei, Y. Rong, H. Liu, X. Li, and H. Han, “Stable large-area (10 × 10  cm2) printable mesoscopic perovskite module exceeding 10% efficiency,” Sol. RRL 1, 1600019 (2017).
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X. Ren, L. Xie, W. B. Kim, D. G. Lee, H. S. Jung, and S. F. Liu, “Chemical bath deposition of co-doped TiO2 electron transport layer for hysteresis-suppressed high-efficiency planar perovskite solar cells,” Sol. RRL 3, 1900176 (2019).
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C. Liang, P. Li, H. Gu, Y. Zhang, F. Li, Y. Song, G. Shao, N. Mathews, and G. Xing, “One-step inkjet printed perovskite in air for efficient light harvesting,” Sol. RRL 2, 1700217 (2018).
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Sustain. Energy Fuels (1)

J. B. Whitaker, D. H. Kim, B. W. Larson, F. Zhang, J. J. Berry, M. F. A. M. van Hest, and K. Zhu, “Scalable slot-die coating of high performance perovskite solar cells,” Sustain. Energy Fuels 2, 2442–2449 (2018).
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Other (2)

http://www.microquanta.com/ .

https://www.nrel.gov/pv/assets/pdfs/best-research-cell-efficiencies.20200218.pdf .

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Figures (12)

Fig. 1.
Fig. 1. (a) One-step deposited perovskite films. (b) Two-step deposited perovskite films. (c) J-V curve of the best large cell endowed with anti-reflection film. (d) J-V curve of the PSCs in large size of 1cm2 measured under reverse and forward scan under one-sun condition. (a), (b) Reproduced with permission [26], Copyright 2018, Royal Society of Chemistry. (c) Reproduced with permission [17], Copyright 2015, American Association for the Advancement Science. (d) Reproduced with permission [19], Copyright 2017, Nature Publishing Group.
Fig. 2.
Fig. 2. (a) Schematic illustration for the blade coating of perovskite film in the Landau–Levich mode. (b) The perovskite film’s thickness as a function of blade-coating speed by coating a 1 mol/L MAPbI3/DMF solution on a 145°C preheated substrate. (c) Schematic illustration for N2-knife-assisted blade coating of perovskite films. (d) Schematic illustration showing the drying of ink into a perovskite/intermediate film and full crystallization of a perovskite film. VNCS, volatile noncoordinating solvent; NVCS, nonvolatile coordinating solvent. (a) Reproduced with permission [21], Copyright 2018, Nature Publishing Group. (b)–(d) Reproduced with permission [29], Copyright 2019, American Association for the Advancement Science.
Fig. 3.
Fig. 3. (a) Schematic illustration of the key steps involved in slot-die coating of perovskite thin films. (b) and (c) Schematic drawing of a module and J-V curve of an organometal halide perovskite solar cell, respectively. (d) The slot-die coating process for preparing CH3NH3PbI3 films. (e) and (f) 15.24 cm × 15.24 cm perovskite module and I-V curve, respectively. (a) Reproduced with permission [30], Copyright 2018, Royal Society of Chemistry. (b) and (c) Reproduced with permission [31], Copyright 2014, Wiley. (d) Reproduced with permission [33], Copyright 2018, Elsevier. (e) and (f) Reproduced with permission [34], Copyright 2018, Elsevier.
Fig. 4.
Fig. 4. (a) Schematic of concurrently pumped ultrasonic spray coating for perovskite precursor deposition. (b) A spray-coated four-cell module (3.8cm2) from the 75% (molar fraction) PbAc2 with PbCl2. (c) and (d) Schematic representation of the megasonic spray-coating process and J-V curves of perovskite solar cells, respectively. (a) and (b) Reproduced with permission [35], Copyright 2016, Royal Society of Chemistry. (c) and (d) Reproduced with permission [38], Copyright 2018, Wiley.
Fig. 5.
Fig. 5. Schematic diagrams for the two main inkjet-printing methods: (a) continuous inkjet printing (CIJ); (b) drop-on-demand (DOD) inkjet printing. (c) 10cm×10cm device and (d) 10cm×5cm device. (e) Schematic illustration of PSC fabrication through inkjet printing with vacuum annealing. (f) J–V curves of PSCs on inkjet printing with active area 2.02cm2. (a) and (b) Reproduced with permission [40], Copyright 2019, Wiley. (c) and (d) Reproduced with permission [41], Copyright 2016, Royal Society of Chemistry. (e) Reproduced with permission [42], Copyright 2018, Wiley. (f) Reproduced with permission [43], Copyright 2018, Elsevier.
Fig. 6.
Fig. 6. (a)–(c) Roll-to-roll processing setup for continuous preparation of perovskite solar cells. (a) Reproduced with permission [34], Copyright 2018, Elsevier. (b) Reproduced with permission [44], Copyright 2019, Wiley. (c) Reproduced with permission [45], Copyright 2019, Wiley.
Fig. 7.
Fig. 7. (a) Schematic illustration of vacuum-flash-assisted solution processing (VASP). (b) Surface scanning electron microscope (SEM) images of the perovskite films fabricated by the conventional process and vacuum-assisted solution process. (c) Diagram of the pressure-processing method for the deposition of perovskite films. (d) Surface SEM images of the perovskite films fabricated by the pressure-processing method and spin coating. (a) and (b) Reproduced with permission [20], Copyright 2015, Royal Society of Chemistry. (c) and (d) Reproduced with permission [46], Copyright 2016, American Association for the Advancement of Science.
Fig. 8.
Fig. 8. Evolution of the best reported lab-cell (0.1cm2) efficiencies and large-area (1.0cm2) device efficiencies. Reproduced with permission [47], Copyright 2018, American Association for the Advancement of Science.
Fig. 9.
Fig. 9. SEM images of (a) surfaces and (b) cross-sections of perovskite films prepared with different solvents, respectively. Reproduced with permission [29], Copyright 2018, American Association for the Advancement of Science.
Fig. 10.
Fig. 10. (a) Morphological characterization of perovskite MAPbI3 films with different amounts of Cl incorporation by optical microscopy (top row), SEM (middle row), and atomic force microscope (AFM) (bottom row). (b) Top-view SEM images of perovskite films prepared with different excess amounts of MACl using blade-coating (top row) and spin-coating (bottom row) methods. (c) Photograph of the 1.1 μm thick MAPbI3 (Cl) film on a 5cm×5cm substrate, 12.0cm2 six-cell perovskite solar module, and J–V curve of the 5cm×5cm perovskite module with an active area of 12.0cm2. (d) Schematic illustration of perovskite film nucleation/crystallization from solvent bathing. (a) Reproduced with permission [51], Copyright 2016, Wiley. (b) Reproduced with permission [52], Copyright 2017, Nature Publishing Group. (c) Reproduced with permission [53], Copyright 2018, Nature Publishing Group. (d) Reproduced with permission [54], Copyright 2015, Wiley.
Fig. 11.
Fig. 11. (a)–(d) Top-view SEM images of perovskite films made with different amounts PbCl2 in the mixed lead source. (e) The crystal grain size and pinhole area in the perovskite films as a function of PbCl2 fraction. (f) XRD patterns and UV-Vis spectra, and (g)–(i) SEM images of FAMA/CsFAMA/KCsFAMA perovskite films, respectively. (j) Optical image of a 10cm×10cm HCVD Cs0.1FA0.9PbI2.9Br0.1-based solar module. (k) J-V curve of the champion solar module (14 subcells in series). (a)–(e) Reproduced with permission [55], Copyright 2016, Royal Society of Chemistry. (f)–(i) Reproduced with permission [56], Copyright 2017, Royal Society of Chemistry. (j) and (k) Reproduced with permission [57], Copyright 2019, Royal Society of Chemistry.
Fig. 12.
Fig. 12. (a) Scheme of the cell configuration highlighting the doped charge carrier extraction layers. (b) J–V curve of the best large cell endowed with antireflection film. (c) Comparison of the Bifluo-OMeTAD molecule (upper) and Spiro-OMeTAD (Merck) molecule. (d) J-V curve of PSCs with HTLs Bifluo-OMeTAD and Spiro-OMeTAD. (e) The structure of using P3HT as the HTL and structure of the interface between the P3HT and WBH. (f) I-V curves of solar modules formed by depositing the P3HT layer using bar-coating (purple) and spin-coating (orange) methods. (g) The DFT simulation of GO and Cl-GO. (h) PL spectra and TRPL spectra for different films. (a) and (b) Reproduced with permission [19], Copyright 2017, Wiley. (c) and (d) Reproduced with permission [74], Copyright 2017, Nature Publishing Group. (e) and (f) Reproduced with permission [75], Copyright 2019, Nature Publishing Group. (g) and (h) Reproduced with permission [76], Copyright 2019, American Association for the Advancement of Science.

Tables (2)

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Table 1. Photovoltaic Performance of Perovskite Solar Cells Prepared by Different Methods

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Table 2. Photovoltaic Performance of Perovskite Solar Cells Prepared by Using Different Materials as Additives for Perovskite Layers

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