Abstract

We report on a theoretical investigation on the influence of different wavelength scale periodic grating architectures on dye sensitized solar cell (DSC). A broadband absorption enhancement is expected in such solar cells thanks to diffraction effects produced by these structures. Their optimal size has been analyzed in terms of pitch grating, height and position along the solar cell layers. Numerical simulations indicate that nanostructuring the interface between the active and the electrolyte layer by integrating a dielectric grating produces an absorption enhancement of 23.4%. The presented results have been also evaluated in view of feasible realistic structures compatible with low cost soft lithographic techniques.

©2012 Optical Society of America

1. Introduction

Dye sensitized solar cells (DSCs) are photovoltaic devices which provide a technically feasible and cost effective alternative to silicon based devices. Since their discovery in 1991 by Graetzel and O’Reagan [1,2] conversion efficiency higher than 10% have been recently reached [36]. A prototypical DSC consists of a ≈10 μm thick active layer composed by mesoporous titania (TiO2), a wide band-gap oxide, doped with fluorescent dye molecules and an electrolyte layer of about 40 μm, both enclosed between two transparent conducting glasses (Fluorine doped Tin Oxide, FTO). One of the most common molecules employed as “dye sensitizer” is a complex named SQ2 [7]. Exposure of a DSC to solar light through the upper electrode results in the photoexcitation of the dye producing photogenerated electrons which can reach the bottom photoelectrode giving rise to an electrical signal. The dye’s electrical neutrality is re-established by an electrolyte (the redox couple I-/I3-). On the counterelectrode a thin (≈10 nm) platinum layer acts as a catalyst for the reaction between I3- and I-.

So far different strategies have been pursued to improve the efficiency of such devices. These include: improvement of the mesoporous oxide film morphology (which has an impact on electron transport) [8,9], research of new dyes /dye blends capable of harvesting solar light over a broad spectral range extending to the near IR region [1012], optimization of the electrolyte species to obtain a good matching between the energy levels and an improvement of the ionic conductivity [13].

In addition to the above reported traditional approaches novel strategies to improve the light harvesting of the DSCs appeared recently. These belong to a wider framework of efficient photon management techniques and include the use of scattering centers [14,15], photonic crystals [1618], superstructures [1921] and scattering layers [22] either inside the TiO2 layer or in its backside. Also prism coupling [23] and waveguides DSCs [24] have been proposed. All these strategies aimed at an enhancement of the radiation absorption by increasing the light path in the active layer either by scattering or light confinement. Introduction of periodic structures (such as gratings) into the cell architecture is a very promising way to obtain such an enhancement as recently demonstrated for thin film organic solar cells [18,19,25].

In the present work we studied by two-dimensional (2D) finite-elements method (FEM) the effect of periodic grating structures on DSC performances. The simulations have been accomplished by COMSOL Multiphysics software package [26]. A typical DSC model has been considered for the calculation. Such model has been slightly modified by introducing grating structures in different position along the cell. In the simulation both the pitch of the grating and the height have been varied. Energy density distribution and absorption of the active layer (the titania layer where the fluorescent dye is inserted) have been calculated and compared with the cell without nanostructurization. We found that the best results regarding enhancement of the energy density and absorption in the DSC active layer are obtained for a grating structure inserted between the dye-sensitized TiO2 and the electrolyte layer.

Concerning the evaluation of the grating parameters, we took into account, in order to optimize pitch and height of the structures, the geometrical constraints connected to their practical feasibility by means of low-cost standard soft-lithographic techniques. These methods can be straightforwardly applied to dielectric materials attainable via sol-gel process. A grating pitch of 500 nm with a height of 300 nm results to be a good choice considering the optical properties of these materials. With such a nanostructurization an improvement in the overall absorption of the active layer of 23.4% (integrated in the spectral range 500-750 nm) with respect to the bare DSC has been found.

2. Structure

The model structure of the DSC device we have used in our simulations is showed in Fig. 1 . It closely resembles the actual cells (except for the lack of the top and bottom soda lime glass substrates) produced and characterized by the Center for Hybrid and Organic Solar Energy (CHOSE) [27]. It can be schematized as a stack of parallel sections of different materials consisting, from top to the bottom, in:

 figure: Fig. 1

Fig. 1 (a) A cross-section of the DSC model. The scheme is not in scale and without top and bottom macroscopic glass substrates. (b) Illustrative figure of the type of 1D rectangular grating structure. (c) Definition of the grating parameters: height and pitch.

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  • - 500 nm thick fluorine-doped tin oxide layer (FTO);
  • - a layer of dye-sensitized titania with a thickness of 10 micron;
  • - a 40 micron thick layer of a iodized electrolyte;
  • - 500 nm thick fluorine-doped tin oxide layer (FTO).

With respect to the above described model, our actual cells have a very thin platinum layer (about few tens of nanometers) located between the electrolyte and the FTO layer. We have decided to exclude such thin layer from the simulation since the mesh parameters used for calculation cannot account for too small sizes in order to have reasonable computation time.

Since the main goal of this paper is the evaluation of the effect of the inclusion of nanostructures between the layers of the DSC, the model presented in Fig. 1 has been consequently modified with inclusion of periodic 1-dimensional nanostructures, i.e. a periodic grating, in different positions (vide infra).

In order to perform the most reliable simulations, the physical and geometrical parameters, i.e. the refractive indices, the absorption coefficients and the thicknesses of each layers, have been either taken from tabulated values when available or experimentally determined by means of absorption and spectroscopic ellipsometry measurements on actual cells (doped with SQ2 dye) provided by CHOSE. In particular, in Table 1 are reported the n and k values used for simulation for DSC layers at 700 nm wavelength.

Tables Icon

Table 1. Refractive index (n) and absorption coefficient (k) at 700 nm wavelength for the DSC layers and for dielectric sol-gel based material.

3. Modeling method

We performed two-dimensional (2D) FEM calculations of energy density, Poynting vector and absorption on the model cell described above. The solar light illumination (in the range 500-750 nm which is relevant for the used dye) has been assumed as an incident plane wave of constant intensity and only TE polarization on the top edge of the structure was taken into account for the sake of simplicity. The width of the repeated unit used in the simulation has been set to 20 micrometers. Periodical boundary conditions have been imposed on the lateral edges of the unit. Its dimension has been chosen only after several comparisons with different widths in order to verify their irrelevance for the simulation results and to ensure reasonable computing time. The errors given by the results of our simulations with COMSOL are given by a quality factor dependent on the ratio between the real areas of the layers and the areas of the bi-dimensional meshes (used to cover the real areas) and implemented in the simulations. We have estimated a maximum error of about 6% of the numerical results regarding electric field, Poynting vector and local energy density.

The numerical results for the absorption have been calculated by an integration of the divergence of the Poynting vector in the active layer:

S=I2Z.
where I is the intensity of the electric field and Z is the electric impedance of the material. The absorption coefficient at a fixed wavelength λ is therefore defined as:
α(λ)=log(I0I)=log(I0n(λ)2Z0S).
where I0 is the intensity of the incident electric field, n(λ) is the refractive index as a function of wavelength and Z0 is the electric impedance of the vacuum which is related to Z by Z = Z0/n(λ).

4. Results and discussion

In order to estimate the impact on the energy density of the inclusion and location of nanostructures, the basic model shown in Fig. 1 was suitable modified by the inclusion of periodic 1-dimensional rectangular grating. In Fig. 2 we report the relative energy density defined as:

ugratunogratunograt.
where ugrat and unograt are the energy density in the active layer with and without grating in the following cases:

 figure: Fig. 2

Fig. 2 Relative energy density in the dye-sensitized titania for different grating position along the DSC layers.

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  • A. without grating;
  • B. grating between the top FTO layer and the dye-sensitized titania;
  • C. grating between the dye-sensitized titania and the electrolyte;
  • D. hybrid sol-gel based grating between the dye-sensitized titania and the electrolyte;
  • E. two gratings, the first one located between the top FTO layer and the dye-sensitized titania and the second one between the dye-sensitized titania and the electrolyte (aligned one below the other).

The values of the energy density have been obtained by a numerical integration on the absorbing dye-sensitized titania layer, where we want to get maximum light confinement. It has to be noted that the results of the integration has been divided by the lateral size of the integration domain (the unit of 20 µm) in order to have an energy density independent from the particular lateral width. A grating having a pitch of 500 nm and a height of 100 nm was employed for the simulation. The energy density distribution was estimated for an incident wavelength of 700 nm. Such wavelength has been chosen on the basis that an increase of the energy density and absorption in this spectral region is desirable since the availability of the solar energy is quite relevant while the commercial dye absorption is usually quite low.

We notice that the energy density (normalized for the lateral width as explained above), which in the case of no grating (case A) was about 6.91 * 10−10 J/m2, increases with the inclusion of a surface structurization. In the case B a very little effect can be observed. In case C a more visible effect has been found and the improvement in the energy density was about 20%. Case D where a sol-gel based layer was included between titania and electrolyte layer gives better results with respect to the previous cases. Moreover, a double grating (case E) does not produce any significant increasing of the energy density with respect to the case of only one grating. Similar behavior for the energy density enhancement respect to the grating position has been obtained also varying grating pitch and depth. In the following we report a detailed study on the grating parameters (pitch and height) for the case where the grating is made of a dielectric material and is positioned at the interface between titania and electrolyte layers (case D). We decided to deepen such case, instead of the more simple case of the direct modulation of the titania layer for two reasons. The first one is related to the higher relative energy density, even if the improvement is only of 1.2% with respect to the bare modulation of the titania layer, and the second one and more important is related to the experimental possibility to engineerize the dielectric layer changing its composition thanks to the sol-gel technique [28,29].

In Fig. 3(a) we plot a typical result given by 2D FEM for the energy density distribution at the edge between the titania (upper layer) and electrolyte layer (lower part of the sketch) for the bare DSC model. The color scale for the energy density is given in the figure and the vertical and horizontal numerical scales show the real dimensions of the 2D cell in meters. The energy density distribution is represented for an incident wavelength of 700 nm.

 figure: Fig. 3

Fig. 3 Energy density distribution at the interface between titania and electrolyte layers without (a) and with grating (b).

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In Fig. 3(b) is reported the energy density distribution for 700 nm wavelength at the same interface (titania/electrolyte layer) with the presence of a dielectric grating having 300 nm height and 500 nm periodicity. The resulting effect, governed by the light diffraction of the grating, is an evident redistribution of the radiation. The energy density is concentrated in bunches both in the electrolyte and in the active layer. Integrating the energy density on the whole active layer, the value results higher compared to the case without grating and such an effect yields useful absorption in that zone.

On the basis of these results we decided to adopt the configuration with the grating between the titania and the electrolyte in the following simulations aimed at optimize the grating shape (height and pitch).

We started calculating the energy density in the active layer for a fixed periodicity of 500 nm and different height of the grating, ranging from 100 to 700 nm. Figure 4(a) shows the relative energy density as a function of the grating height. We report the relative energy density as a function of four incident wavelengths, namely: 500, 600, 650 and 700 nm. The effect of the grating, regarding the increasing of the energy density, is more evident for 500 and 700 nm wavelength, while for the 600 and 650 nm we don’t record any effect of the nanostructures on the energy density in the DSC active layer. Such an effect can be explained considering that at the intermediate wavelengths the dye absorption is very high and therefore the solar radiation arriving at the grating position is very low since it is already absorbed in the first part of the doped titania layer. As a consequence the total integral gives a minor contribution and the diffractive effect is strongly hampered. Figure 4(b) shows the effect on the relative energy density calculated in the active layer as a function of the periodicity for a fixed grating height of 300 nm. In a similar way as discussed above, the effect of the grating is more evident for the wavelengths where the absorption is low (500 and 700 nm), while the effect is negligible for wavelengths where the absorption is quite high.

 figure: Fig. 4

Fig. 4 Relative energy density confined in the dye-sensitized titania layer as a function of the height for a 500 nm pitch grating (a) and as a function of the pitch grating for a 300 nm grating height (b). Values are reported for different wavelengths (see labels in the figure).

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In view of a possible practical implementation of nanostructures on actual DSC devices, we have focused on the case of a grating having a pitch of 500 nm and with height equal to 300 nm. With this configuration we have simulated the absorption spectrum of the dye-sensitized titania layer starting from the parameters of a real DSC as reported in Fig. 5(a) . A broadband enhancement in the spectral range 500 - 750 nm due to the presence of the grating structure can be noticed. Figure 5(b) shows the difference between the simulated absorption spectra with and without grating displaying that the enhancement in the absorption is more pronounced for longer wavelengths. This physical effect is extremely important, since in this range the absorption of many commercial dyes is usually quite low, while the availability of solar energy is relevant.

 figure: Fig. 5

Fig. 5 (a) Absorption spectra of the active layer given by numerical simulation of the DSC with (red line-filled squares) and without grating (green line-open circles). (b) Difference in the absorption spectra with and without grating.

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In order to evaluate the overall effect of the nanostructurization on the DSC device we performed the calculation of the absorption enhancement factor defined as:

λABSgratλABSnogratλABSnograt.
where ABSgrat and ABSnograt indicate the absorption coefficient calculated in the active layer with Eq. (2) as a function of wavelengths in the case with and without grating, respectively. It has been found that in the range 500-750 nm an enhancement of 23.4% was obtained thanks to the presence of the nanostructurization at the titania/electrolyte interface. Such an enhancement in the absorption features does not correspond necessarily to a direct increase of the DSC photocurrent, however surely it would increase the overall performances of the cell. The analysis performed in the present study clearly indicates the type and position of the grating in the cell. Such a hint will be precious for our group in the fabrication of the next DSCs .

5. Conclusions

The influence of different light trapping schemes on the performance of a realistic DSC device has been investigated with numerical simulations. We demonstrated that it is possible to achieve a broadband absorption enhancement by integrating a dielectric sol-gel based grating at the interface between the dye-sensitized titania and the electrolyte layer. Grating pitch and height have been studied by means of an accurate analysis of the cell performances and grating parameters (500 nm pitch and 300 nm height) for an efficient result have been precisely evaluated. The improvement in the absorption, integrated in all the analyzed range (500-750 nm) was 23.4%. In addition the more relevant improvement was found for wavelengths above 700 nm where the solar energy is still intense but the absorption of the sensitizer is low. The choice to investigate dielectric gratings fabricated by sol-gel technique is related to the great advantages offered by such process regarding the simplicity of the fabrication via soft lithography and the possibility of an easy fine tuning of the optical properties of the structure that could give even best results in terms of light management.

Acknowledgments

We are indebted to Dr. Lorenzo Dominici and Dr. Daniele Colonna for the many stimulating discussions and suggestions in the early stage of this study and for technical support. We thank the Center for Hybrid and Organic Solar Energy (CHOSE) for providing us with DSCs. This work was supported by the Italian CARIPLO foundation through the project number 2010-0525.

References and links

1. B. O’Regan and M. Gratzel, “A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films,” Nature 353(6346), 737–740 (1991). [CrossRef]  

2. A. Kay and M. Gratzel, “Low cost photovoltaic modules based on dye sensitized nanocrystalline titanium dioxide and carbon powder,” Sol. Energy Mater. Sol. Cells 44(1), 99–117 (1996). [CrossRef]  

3. F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008). [CrossRef]   [PubMed]  

4. C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009). [CrossRef]   [PubMed]  

5. M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006). [CrossRef]  

6. B. E. Hardin, H. J. Snaith, and M. D. McGehee, “The renaissance of dye-sensitized solar cells,” Nat. Photonics 6(3), 162–169 (2012). [CrossRef]  

7. SOLARONIX, www.solaronix.com.

8. J. R. Durrant, S. A. Haque, and E. Palomares, “Towards optimization of electron transfer processes in Dye sensitized solar cells,” Coord. Chem. Rev. 248(13-14), 1247–1257 (2004). [CrossRef]  

9. M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008). [CrossRef]  

10. F. Inakazu, Y. Noma, Y. Ogomi, and S. Hayase, “Dye-sensitized solar cells consisting of dye-bilayer structure stained with two dyes for harvesting light of wide range of wavelength,” Appl. Phys. Lett. 93(9), 093304–1 (2008). [CrossRef]  

11. Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005). [CrossRef]   [PubMed]  

12. J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007). [CrossRef]   [PubMed]  

13. M. Gorlov and L. Kloo, “Ionic liquid electrolytes for dye-sensitized solar cells,” Dalton Trans. 20(20), 2655–2666 (2008). [CrossRef]   [PubMed]  

14. S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005). [CrossRef]   [PubMed]  

15. J. R. Nagel and M. A. Scarpulla, “Enhanced absorption in optically thin solar cells by scattering from embedded dielectric nanoparticles,” Opt. Express 18(S2Suppl 2), A139–A146 (2010). [CrossRef]   [PubMed]  

16. S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003). [CrossRef]   [PubMed]  

17. A. Mihi, M. E. Calvo, J. A. Anta, and H. Miguez, “Spectral response of opal based dye-sensitized solar cells,” J. Phys. Chem. C 112(1), 13–17 (2008). [CrossRef]  

18. S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012). [CrossRef]  

19. K. Q. Le, A. Abass, B. Maes, P. Bienstman, and A. Alù, “Comparing plasmonic and dielectric gratings for absorption enhancement in thin-film organic solar cells,” Opt. Express 20(1), A39–A50 (2012). [CrossRef]   [PubMed]  

20. Z. Yu, A. Raman, and S. Fan, “Fundamental limit of light trapping in grating structures,” Opt. Express 18(S1Suppl 3), A366–A380 (2010). [CrossRef]   [PubMed]  

21. A. Naqavi, K. Söderström, F.-J. Haug, V. Paeder, T. Scharf, H. P. Herzig, and C. Ballif, “Understanding of photocurrent enhancement in real thin film solar cells: towards optimal one-dimesional grating,” Opt. Express 19(1), 128–140 (2011). [CrossRef]  

22. D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010). [CrossRef]  

23. L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010). [CrossRef]  

24. S. Rühle, S. Greenwald, E. Koren, and A. Zaban, “Optical waveguide enhanced photovoltaics,” Opt. Express 16(26), 21801–21806 (2008). [CrossRef]   [PubMed]  

25. A. Raman, Z. Yu, and S. Fan, “Dielectric nanostructures for broadband light trapping in organic solar cells,” Opt. Express 19(20), 19015–19026 (2011). [CrossRef]   [PubMed]  

26. COMSOLTM, www.comsol.com.

27. Center for Hybrid and Organic Solar Energy (CHOSE), www.chose.uniroma2.it.

28. P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010). [CrossRef]  

29. G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007). [CrossRef]  

References

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  1. B. O’Regan and M. Gratzel, “A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films,” Nature 353(6346), 737–740 (1991).
    [Crossref]
  2. A. Kay and M. Gratzel, “Low cost photovoltaic modules based on dye sensitized nanocrystalline titanium dioxide and carbon powder,” Sol. Energy Mater. Sol. Cells 44(1), 99–117 (1996).
    [Crossref]
  3. F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
    [Crossref] [PubMed]
  4. C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
    [Crossref] [PubMed]
  5. M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006).
    [Crossref]
  6. B. E. Hardin, H. J. Snaith, and M. D. McGehee, “The renaissance of dye-sensitized solar cells,” Nat. Photonics 6(3), 162–169 (2012).
    [Crossref]
  7. SOLARONIX, www.solaronix.com .
  8. J. R. Durrant, S. A. Haque, and E. Palomares, “Towards optimization of electron transfer processes in Dye sensitized solar cells,” Coord. Chem. Rev. 248(13-14), 1247–1257 (2004).
    [Crossref]
  9. M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
    [Crossref]
  10. F. Inakazu, Y. Noma, Y. Ogomi, and S. Hayase, “Dye-sensitized solar cells consisting of dye-bilayer structure stained with two dyes for harvesting light of wide range of wavelength,” Appl. Phys. Lett. 93(9), 093304–1 (2008).
    [Crossref]
  11. Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
    [Crossref] [PubMed]
  12. J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
    [Crossref] [PubMed]
  13. M. Gorlov and L. Kloo, “Ionic liquid electrolytes for dye-sensitized solar cells,” Dalton Trans. 20(20), 2655–2666 (2008).
    [Crossref] [PubMed]
  14. S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
    [Crossref] [PubMed]
  15. J. R. Nagel and M. A. Scarpulla, “Enhanced absorption in optically thin solar cells by scattering from embedded dielectric nanoparticles,” Opt. Express 18(S2Suppl 2), A139–A146 (2010).
    [Crossref] [PubMed]
  16. S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
    [Crossref] [PubMed]
  17. A. Mihi, M. E. Calvo, J. A. Anta, and H. Miguez, “Spectral response of opal based dye-sensitized solar cells,” J. Phys. Chem. C 112(1), 13–17 (2008).
    [Crossref]
  18. S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
    [Crossref]
  19. K. Q. Le, A. Abass, B. Maes, P. Bienstman, and A. Alù, “Comparing plasmonic and dielectric gratings for absorption enhancement in thin-film organic solar cells,” Opt. Express 20(1), A39–A50 (2012).
    [Crossref] [PubMed]
  20. Z. Yu, A. Raman, and S. Fan, “Fundamental limit of light trapping in grating structures,” Opt. Express 18(S1Suppl 3), A366–A380 (2010).
    [Crossref] [PubMed]
  21. A. Naqavi, K. Söderström, F.-J. Haug, V. Paeder, T. Scharf, H. P. Herzig, and C. Ballif, “Understanding of photocurrent enhancement in real thin film solar cells: towards optimal one-dimesional grating,” Opt. Express 19(1), 128–140 (2011).
    [Crossref]
  22. D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
    [Crossref]
  23. L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
    [Crossref]
  24. S. Rühle, S. Greenwald, E. Koren, and A. Zaban, “Optical waveguide enhanced photovoltaics,” Opt. Express 16(26), 21801–21806 (2008).
    [Crossref] [PubMed]
  25. A. Raman, Z. Yu, and S. Fan, “Dielectric nanostructures for broadband light trapping in organic solar cells,” Opt. Express 19(20), 19015–19026 (2011).
    [Crossref] [PubMed]
  26. COMSOLTM, www.comsol.com .
  27. Center for Hybrid and Organic Solar Energy (CHOSE), www.chose.uniroma2.it .
  28. P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010).
    [Crossref]
  29. G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
    [Crossref]

2012 (3)

B. E. Hardin, H. J. Snaith, and M. D. McGehee, “The renaissance of dye-sensitized solar cells,” Nat. Photonics 6(3), 162–169 (2012).
[Crossref]

S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
[Crossref]

K. Q. Le, A. Abass, B. Maes, P. Bienstman, and A. Alù, “Comparing plasmonic and dielectric gratings for absorption enhancement in thin-film organic solar cells,” Opt. Express 20(1), A39–A50 (2012).
[Crossref] [PubMed]

2011 (2)

2010 (5)

P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010).
[Crossref]

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
[Crossref]

Z. Yu, A. Raman, and S. Fan, “Fundamental limit of light trapping in grating structures,” Opt. Express 18(S1Suppl 3), A366–A380 (2010).
[Crossref] [PubMed]

J. R. Nagel and M. A. Scarpulla, “Enhanced absorption in optically thin solar cells by scattering from embedded dielectric nanoparticles,” Opt. Express 18(S2Suppl 2), A139–A146 (2010).
[Crossref] [PubMed]

2009 (1)

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

2008 (6)

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

F. Inakazu, Y. Noma, Y. Ogomi, and S. Hayase, “Dye-sensitized solar cells consisting of dye-bilayer structure stained with two dyes for harvesting light of wide range of wavelength,” Appl. Phys. Lett. 93(9), 093304–1 (2008).
[Crossref]

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

M. Gorlov and L. Kloo, “Ionic liquid electrolytes for dye-sensitized solar cells,” Dalton Trans. 20(20), 2655–2666 (2008).
[Crossref] [PubMed]

S. Rühle, S. Greenwald, E. Koren, and A. Zaban, “Optical waveguide enhanced photovoltaics,” Opt. Express 16(26), 21801–21806 (2008).
[Crossref] [PubMed]

A. Mihi, M. E. Calvo, J. A. Anta, and H. Miguez, “Spectral response of opal based dye-sensitized solar cells,” J. Phys. Chem. C 112(1), 13–17 (2008).
[Crossref]

2007 (2)

G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
[Crossref]

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
[Crossref] [PubMed]

2006 (1)

M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006).
[Crossref]

2005 (2)

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
[Crossref] [PubMed]

2004 (1)

J. R. Durrant, S. A. Haque, and E. Palomares, “Towards optimization of electron transfer processes in Dye sensitized solar cells,” Coord. Chem. Rev. 248(13-14), 1247–1257 (2004).
[Crossref]

2003 (1)

S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
[Crossref] [PubMed]

1996 (1)

A. Kay and M. Gratzel, “Low cost photovoltaic modules based on dye sensitized nanocrystalline titanium dioxide and carbon powder,” Sol. Energy Mater. Sol. Cells 44(1), 99–117 (1996).
[Crossref]

1991 (1)

B. O’Regan and M. Gratzel, “A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films,” Nature 353(6346), 737–740 (1991).
[Crossref]

Abass, A.

Abrams, N.

S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
[Crossref] [PubMed]

Alibabaei, L.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

Alù, A.

Anta, J. A.

A. Mihi, M. E. Calvo, J. A. Anta, and H. Miguez, “Spectral response of opal based dye-sensitized solar cells,” J. Phys. Chem. C 112(1), 13–17 (2008).
[Crossref]

Arakawa, H.

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

Ballif, C.

Benkstein, K. D.

S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
[Crossref] [PubMed]

Bienstman, P.

Brown, T. M.

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
[Crossref]

Brunetti, A.

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

Brusatin, G.

G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
[Crossref]

Calvo, M. E.

A. Mihi, M. E. Calvo, J. A. Anta, and H. Miguez, “Spectral response of opal based dye-sensitized solar cells,” J. Phys. Chem. C 112(1), 13–17 (2008).
[Crossref]

Casalboni, M.

P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010).
[Crossref]

G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
[Crossref]

Chen, C. Y.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

Colodrero, S.

S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
[Crossref]

Colonna, D.

L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
[Crossref]

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

Crossland, E. J. W.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

D’Ercole, D.

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

Dan-oh, Y.

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

Decoppet, J. D.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

Della Giustina, G.

G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
[Crossref]

Di Carlo, A.

L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
[Crossref]

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

Dominici, L.

L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
[Crossref]

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

Ducati, C.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Durrant, J. R.

J. R. Durrant, S. A. Haque, and E. Palomares, “Towards optimization of electron transfer processes in Dye sensitized solar cells,” Coord. Chem. Rev. 248(13-14), 1247–1257 (2004).
[Crossref]

Eder, D.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Emery, K.

M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006).
[Crossref]

Fan, S.

Forneli, A.

S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
[Crossref]

Frank, A. J.

S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
[Crossref] [PubMed]

Gao, F.

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

Geiger, T.

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
[Crossref] [PubMed]

Gorlov, M.

M. Gorlov and L. Kloo, “Ionic liquid electrolytes for dye-sensitized solar cells,” Dalton Trans. 20(20), 2655–2666 (2008).
[Crossref] [PubMed]

Gratzel, M.

A. Kay and M. Gratzel, “Low cost photovoltaic modules based on dye sensitized nanocrystalline titanium dioxide and carbon powder,” Sol. Energy Mater. Sol. Cells 44(1), 99–117 (1996).
[Crossref]

B. O’Regan and M. Gratzel, “A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films,” Nature 353(6346), 737–740 (1991).
[Crossref]

Grätzel, C.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

Grätzel, M.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
[Crossref] [PubMed]

Green, M. A.

M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006).
[Crossref]

Greenwald, S.

Guglielmi, M.

G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
[Crossref]

Guldin, S.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Halaoui, L. I.

S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
[Crossref] [PubMed]

Haque, S. A.

J. R. Durrant, S. A. Haque, and E. Palomares, “Towards optimization of electron transfer processes in Dye sensitized solar cells,” Coord. Chem. Rev. 248(13-14), 1247–1257 (2004).
[Crossref]

Hara, K.

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

Hardin, B. E.

B. E. Hardin, H. J. Snaith, and M. D. McGehee, “The renaissance of dye-sensitized solar cells,” Nat. Photonics 6(3), 162–169 (2012).
[Crossref]

Haug, F.-J.

Hayase, S.

F. Inakazu, Y. Noma, Y. Ogomi, and S. Hayase, “Dye-sensitized solar cells consisting of dye-bilayer structure stained with two dyes for harvesting light of wide range of wavelength,” Appl. Phys. Lett. 93(9), 093304–1 (2008).
[Crossref]

Herzig, H. P.

Hishikawa, Y.

M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006).
[Crossref]

Hore, S.

S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
[Crossref] [PubMed]

Humphry-Baker, R.

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

Hüttner, S.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Inakazu, F.

F. Inakazu, Y. Noma, Y. Ogomi, and S. Hayase, “Dye-sensitized solar cells consisting of dye-bilayer structure stained with two dyes for harvesting light of wide range of wavelength,” Appl. Phys. Lett. 93(9), 093304–1 (2008).
[Crossref]

Jang, S. R.

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
[Crossref] [PubMed]

Jing, X.

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

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Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
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A. Kay and M. Gratzel, “Low cost photovoltaic modules based on dye sensitized nanocrystalline titanium dioxide and carbon powder,” Sol. Energy Mater. Sol. Cells 44(1), 99–117 (1996).
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Kern, R.

S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
[Crossref] [PubMed]

Kim, S.

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
[Crossref] [PubMed]

King, D. L.

M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006).
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M. Gorlov and L. Kloo, “Ionic liquid electrolytes for dye-sensitized solar cells,” Dalton Trans. 20(20), 2655–2666 (2008).
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J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
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Koren, E.

Le, K. Q.

Lee, J.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
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S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
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C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
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Lopez-Lopez, C.

S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
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Maes, B.

Mallouk, T. E.

S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
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B. E. Hardin, H. J. Snaith, and M. D. McGehee, “The renaissance of dye-sensitized solar cells,” Nat. Photonics 6(3), 162–169 (2012).
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L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
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D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
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Miguez, H.

S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
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A. Mihi, M. E. Calvo, J. A. Anta, and H. Miguez, “Spectral response of opal based dye-sensitized solar cells,” J. Phys. Chem. C 112(1), 13–17 (2008).
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Naqavi, A.

Nazeeruddin, M. K.

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
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M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
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C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
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S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
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S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
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Nitz, P.

S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
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Noma, Y.

F. Inakazu, Y. Noma, Y. Ogomi, and S. Hayase, “Dye-sensitized solar cells consisting of dye-bilayer structure stained with two dyes for harvesting light of wide range of wavelength,” Appl. Phys. Lett. 93(9), 093304–1 (2008).
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J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
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B. O’Regan and M. Gratzel, “A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films,” Nature 353(6346), 737–740 (1991).
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F. Inakazu, Y. Noma, Y. Ogomi, and S. Hayase, “Dye-sensitized solar cells consisting of dye-bilayer structure stained with two dyes for harvesting light of wide range of wavelength,” Appl. Phys. Lett. 93(9), 093304–1 (2008).
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Orilall, M. C.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
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Orsini, E.

P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010).
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Paeder, V.

Palazzesi, C.

P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010).
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Palomares, E.

S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
[Crossref]

J. R. Durrant, S. A. Haque, and E. Palomares, “Towards optimization of electron transfer processes in Dye sensitized solar cells,” Coord. Chem. Rev. 248(13-14), 1247–1257 (2004).
[Crossref]

Pelleja, L.

S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
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Pootrakulchote, N.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

Prahl, C.

S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
[Crossref] [PubMed]

Prosposito, P.

P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010).
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G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
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Raman, A.

Reale, A.

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
[Crossref]

Roma, G.

G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
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Rühle, S.

Scarpulla, M. A.

Scharf, T.

Schutzmann, S.

G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
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Shi, D.

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

Shinpo, A.

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

Snaith, H. J.

B. E. Hardin, H. J. Snaith, and M. D. McGehee, “The renaissance of dye-sensitized solar cells,” Nat. Photonics 6(3), 162–169 (2012).
[Crossref]

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Söderström, K.

Steiner, U.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Stella, F.

P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010).
[Crossref]

Suga, S.

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

Sugihara, H.

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

Tsai, J. H.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

van de Lagemaat, J.

S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
[Crossref] [PubMed]

Vesce, L.

L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
[Crossref]

Vetter, C.

S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
[Crossref] [PubMed]

Walter, P.

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
[Crossref] [PubMed]

Wang, M.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

Wang, P.

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

Wang, Y.

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

Wang, Z. S.

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

Warren, S. C.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Warta, W.

M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006).
[Crossref]

Wiesner, U.

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Wu, C. G.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

Yu, Z.

Yum, J. H.

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
[Crossref] [PubMed]

Zaban, A.

Zakeeruddin, S. M.

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

Zhang, J.

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

ACS Nano (1)

C. Y. Chen, M. Wang, J. Y. Li, N. Pootrakulchote, L. Alibabaei, C. H. Ngoc-le, J. D. Decoppet, J. H. Tsai, C. Grätzel, C. G. Wu, S. M. Zakeeruddin, and M. Grätzel, “Highly efficient light-harvesting ruthenium sensitizer for thin-film dye-sensitized solar cells,” ACS Nano 3(10), 3103–3109 (2009).
[Crossref] [PubMed]

Adv. Funct. Mater. (1)

S. Colodrero, A. Forneli, C. Lopez-Lopez, L. Pelleja, H. Miguez, and E. Palomares, “Efficient transparent thin dye solar cells based on highly porous 1D photonic crystals,” Adv. Funct. Mater. 22(6), 1303–1310 (2012).
[Crossref]

Appl. Phys. Lett. (2)

L. Dominici, L. Vesce, D. Colonna, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Angular and prism coupling refractive enhancement in dye solar cells,” Appl. Phys. Lett. 96(10), 103302 (2010).
[Crossref]

F. Inakazu, Y. Noma, Y. Ogomi, and S. Hayase, “Dye-sensitized solar cells consisting of dye-bilayer structure stained with two dyes for harvesting light of wide range of wavelength,” Appl. Phys. Lett. 93(9), 093304–1 (2008).
[Crossref]

Chem. Commun. (Camb.) (2)

J. H. Yum, S. R. Jang, P. Walter, T. Geiger, F. Nüesch, S. Kim, J. Ko, M. Grätzel, and M. K. Nazeeruddin, “Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers,” Chem. Commun. (Camb.) 44(44), 4680–4682 (2007).
[Crossref] [PubMed]

S. Hore, P. Nitz, C. Vetter, C. Prahl, M. Niggemann, and R. Kern, “Scattering spherical voids in nanocrystalline TiO2- enhancement of efficiency in dye-sensitized solar cells,” Chem. Commun. (Camb.) 15(15), 2011–2013 (2005).
[Crossref] [PubMed]

Coord. Chem. Rev. (1)

J. R. Durrant, S. A. Haque, and E. Palomares, “Towards optimization of electron transfer processes in Dye sensitized solar cells,” Coord. Chem. Rev. 248(13-14), 1247–1257 (2004).
[Crossref]

Dalton Trans. (1)

M. Gorlov and L. Kloo, “Ionic liquid electrolytes for dye-sensitized solar cells,” Dalton Trans. 20(20), 2655–2666 (2008).
[Crossref] [PubMed]

J. Am. Chem. Soc. (2)

S. Nishimura, N. Abrams, B. A. Lewis, L. I. Halaoui, T. E. Mallouk, K. D. Benkstein, J. van de Lagemaat, and A. J. Frank, “Standing wave enhancement of red absorbance and photocurrent in dye-sensitized titanium dioxide photoelectrodes coupled to photonic crystals,” J. Am. Chem. Soc. 125(20), 6306–6310 (2003).
[Crossref] [PubMed]

F. Gao, Y. Wang, D. Shi, J. Zhang, M. Wang, X. Jing, R. Humphry-Baker, P. Wang, S. M. Zakeeruddin, and M. Grätzel, “Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells,” J. Am. Chem. Soc. 130(32), 10720–10728 (2008).
[Crossref] [PubMed]

J. Phys. Chem. B (1)

Z. S. Wang, K. Hara, Y. Dan-oh, C. Kasada, A. Shinpo, S. Suga, H. Arakawa, and H. Sugihara, “Photophysical and (photo)electrochemical properties of a coumarin dye,” J. Phys. Chem. B 109(9), 3907–3914 (2005).
[Crossref] [PubMed]

J. Phys. Chem. C (1)

A. Mihi, M. E. Calvo, J. A. Anta, and H. Miguez, “Spectral response of opal based dye-sensitized solar cells,” J. Phys. Chem. C 112(1), 13–17 (2008).
[Crossref]

Mater. Sci. and Engineer. C (1)

G. Brusatin, G. Della Giustina, M. Guglielmi, M. Casalboni, P. Prosposito, S. Schutzmann, and G. Roma, “Direct pattern of photocurable glycidoxypropyltrimethoxysilane based sol-gel hybrid waveguides for photonic applications,” Mater. Sci. and Engineer. C 27(5-8), 1022–1025 (2007).
[Crossref]

Nat. Photonics (1)

B. E. Hardin, H. J. Snaith, and M. D. McGehee, “The renaissance of dye-sensitized solar cells,” Nat. Photonics 6(3), 162–169 (2012).
[Crossref]

Nature (1)

B. O’Regan and M. Gratzel, “A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films,” Nature 353(6346), 737–740 (1991).
[Crossref]

Opt. Express (6)

Prog. Photovolt. Res. Appl. (1)

M. A. Green, K. Emery, D. L. King, Y. Hishikawa, and W. Warta, “Solar cell efficiency tables (version 28),” Prog. Photovolt. Res. Appl. 14(5), 455–461 (2006).
[Crossref]

Soft Matter (1)

M. Nedelcu, J. Lee, E. J. W. Crossland, S. C. Warren, M. C. Orilall, S. Guldin, S. Hüttner, C. Ducati, D. Eder, U. Wiesner, U. Steiner, and H. J. Snaith, “Block copolymer directed synthesis of mesoporous TiO2 for dye-sensitized solar cells,” Soft Matter 5(1), 134–139 (2008).
[Crossref]

Sol. Energy Mater. Sol. Cells (1)

A. Kay and M. Gratzel, “Low cost photovoltaic modules based on dye sensitized nanocrystalline titanium dioxide and carbon powder,” Sol. Energy Mater. Sol. Cells 44(1), 99–117 (1996).
[Crossref]

Solid State Sci. (1)

P. Prosposito, M. Casalboni, E. Orsini, C. Palazzesi, and F. Stella, “UV-Nanoimprinting lithography of Bragg Gratings on hybrid sol-gel based channel waveguides,” Solid State Sci. 12(11), 1886–1889 (2010).
[Crossref]

Superlattices Microstruct. (1)

D. Colonna, L. Dominici, D. D’Ercole, A. Brunetti, F. Michelotti, T. M. Brown, A. Reale, and A. Di Carlo, “Photocurrent enhancement of dye solar cells by efficient ligth management,” Superlattices Microstruct. 47(1), 197–201 (2010).
[Crossref]

Other (3)

COMSOLTM, www.comsol.com .

Center for Hybrid and Organic Solar Energy (CHOSE), www.chose.uniroma2.it .

SOLARONIX, www.solaronix.com .

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Figures (5)

Fig. 1
Fig. 1 (a) A cross-section of the DSC model. The scheme is not in scale and without top and bottom macroscopic glass substrates. (b) Illustrative figure of the type of 1D rectangular grating structure. (c) Definition of the grating parameters: height and pitch.
Fig. 2
Fig. 2 Relative energy density in the dye-sensitized titania for different grating position along the DSC layers.
Fig. 3
Fig. 3 Energy density distribution at the interface between titania and electrolyte layers without (a) and with grating (b).
Fig. 4
Fig. 4 Relative energy density confined in the dye-sensitized titania layer as a function of the height for a 500 nm pitch grating (a) and as a function of the pitch grating for a 300 nm grating height (b). Values are reported for different wavelengths (see labels in the figure).
Fig. 5
Fig. 5 (a) Absorption spectra of the active layer given by numerical simulation of the DSC with (red line-filled squares) and without grating (green line-open circles). (b) Difference in the absorption spectra with and without grating.

Tables (1)

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Table 1 Refractive index (n) and absorption coefficient (k) at 700 nm wavelength for the DSC layers and for dielectric sol-gel based material.

Equations (4)

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S = I 2 Z .
α ( λ ) = log ( I 0 I ) = log ( I 0 n ( λ ) 2 Z 0 S ) .
u g r a t u n o g r a t u n o g r a t .
λ A B S g r a t λ A B S n o g r a t λ A B S n o g r a t .

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