Optimization-based design of surface textures for thin-film Si solar cells

Xing Sheng; Steven G. Johnson; Jurgen Michel; Lionel C. Kimerling

doi:10.1364/OE.19.00A841

Optimization-based design of surface textures for thin-film Si solar cells

Xing Sheng, Steven G. Johnson, Jurgen Michel, and Lionel C. Kimerling

Optics Express
Vol. 19,
Issue S4,
pp. A841-A850
(2011)
•https://doi.org/10.1364/OE.19.00A841

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Xing Sheng, Steven G. Johnson, Jurgen Michel, and Lionel C. Kimerling, "Optimization-based design of surface textures for thin-film Si solar cells," Opt. Express 19, A841-A850 (2011)

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Related Topics
Table of Contents Category
- Scattering
Optics & Photonics Topics
?

The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Photovoltaic (040.5350)
- Diffraction and gratings (050.0050)

About this Article
History
- Original Manuscript: May 13, 2011
- Revised Manuscript: June 6, 2011
- Manuscript Accepted: June 8, 2011
- Published: June 16, 2011

Accessible

Open Access

Abstract

We numerically investigate the light-absorption behavior of thin-film silicon for normal-incident light, using surface textures to enhance absorption. We consider a variety of texture designs, such as simple periodic gratings and commercial random textures, and examine arbitrary irregular periodic textures designed by multi-parameter optimization. Deep and high-index-contrast textures exhibit strong anisotropic scattering that is outside the regime of validity of the Lambertian models commonly used to describe texture-induced absorption enhancement for normal incidence. Over a 900–1100 nm wavelength range, our optimized surface texture in two dimensions (2D) enhances absorption by a factor of 2.7πn, considerably larger than the original πn Lambertian result and exceeding by almost 50% a recent generalization of Lambertian model for periodic structures in finite spectral range. However, the πn Lambertian limit still applies for isotropic incident light, and our structure obeys this limit when averaged over all the angles. Therefore, our design can be thought of optimizing the angle/enhancement tradeoff for periodic textures.

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References

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2011 (3)

X. Sheng, J. Liu, I. Kozinsky, A. M. Agarwal, J. Michel, and L. C. Kimerling, “Design and non-lithographic fabrication of light trapping structures for thin film silicon solar cells,” Adv. Mater. (Deerfield Beach Fla.) 23(7), 843–847 (2011), http://dx.doi.org/10.1002/adma.201003217 .
[Crossref]

Z. Yu and S. Fan, “Angular constraint on light-trapping absorption enhancement in solar cells,” Appl. Phys. Lett. 98(1), 011106 (2011), http://link.aip.org/link/doi/10.1063/1.3532099 .
[Crossref]

A. Naqavi, K. Soderström, 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-dimensional gratings,” Opt. Express 19(1), 128–140 (2011), http://www.opticsinfobase.org/abstract.cfm?URI=oe-19-1-128 .
[Crossref] [PubMed]

2010 (7)

Z. Yu, A. Raman, and S. Fan, “Fundamental limit of nanophotonic light trapping in solar cells,” Proc. Natl. Acad. Sci. U.S.A. 107(41), 17491–17496 (2010), http://dx.doi.org/10.1073/pnas.1008296107 .
[Crossref] [PubMed]

J. Wang, J. Hu, X. Sun, A. Agarwal, and L. C. Kimerling, “Cavity-enhanced multispectral photodetector using phase-tuned propagation: theory and design,” Opt. Lett. 35(5), 742–744 (2010), http://www.opticsinfobase.org/abstract.cfm?URI=ol-35-5-742 .
[Crossref] [PubMed]

S. B. Mallick, M. Agrawal, and P. Peumans, “Optimal light trapping in ultra-thin photonic crystal crystalline silicon solar cells,” Opt. Express 18(6), 5691–5706 (2010), http://www.opticsinfobase.org/abstract.cfm?URI=oe-18-6-5691 .
[Crossref] [PubMed]

Z. Yu, A. Raman, and S. Fan, “Fundamental limit of light trapping in grating structures,” Opt. Express 18(S3Suppl 3), A366–A380 (2010), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-S3-A366 .
[Crossref] [PubMed]

C. Lin and M. L. Povinelli, “The effect of plasmonic particles on solar absorption in vertically aligned silicon nanowire arrays,” Appl. Phys. Lett. 97(7), 071110 (2010), http://link.aip.org/link/doi/10.1063/1.3475484 .
[Crossref]

J. Zhu, C. M. Hsu, Z. Yu, S. Fan, and Y. Cui, “Nanodome solar cells with efficient light management and self-cleaning,” Nano Lett. 10(6), 1979–1984 (2010), http://dx.doi.org/10.1021/nl9034237 .
[Crossref]

S. E. Han and G. Chen, “Toward the Lambertian limit of light trapping in thin nanostructured silicon solar cells,” Nano Lett. 10(11), 4692–4696 (2010), http://dx.doi.org/10.1021/nl1029804 .
[Crossref] [PubMed]

2009 (4)

V. E. Ferry, M. A. Verschuuren, H. B. T. Li, R. E. I. Schropp, H. A. Atwater, and A. Polman, “Improved red-response in thin film a-Si:H solar cells with soft-imprinted plasmonic back reflectors,” Appl. Phys. Lett. 95(18), 183503 (2009), http://link.aip.org/link/doi/10.1063/1.3256187 .
[Crossref]

M. Ghebrebrhan, P. Bermel, Y. Avniel, J. D. Joannopoulos, and S. G. Johnson, “Global optimization of silicon photovoltaic cell front coatings,” Opt. Express 17(9), 7505–7518 (2009), http://www.opticsinfobase.org/abstract.cfm?URI=oe-17-9-7505 .
[Crossref] [PubMed]

C. Lin and M. L. Povinelli, “Optical absorption enhancement in silicon nanowire arrays with a large lattice constant for photovoltaic applications,” Opt. Express 17(22), 19371–19381 (2009), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-22-19371 .
[Crossref] [PubMed]

R. Dewan, M. Marinkovic, R. Noriega, S. Phadke, A. Salleo, and D. Knipp, “Light trapping in thin-film silicon solar cells with submicron surface texture,” Opt. Express 17(25), 23058–23065 (2009), http://www.opticsinfobase.org/abstract.cfm?URI=oe-17-25-23058 .
[Crossref]

2008 (4)

J. G. Mutitu, S. Shi, C. Chen, T. Creazzo, A. Barnett, C. Honsberg, and D. W. Prather, “Thin film solar cell design based on photonic crystal and diffractive grating structures,” Opt. Express 16(19), 15238–15248 (2008), http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-19-15238 .
[Crossref] [PubMed]

A. Lin and J. Phillips, “Optimization of random diffraction gratings in thin-film solar cells using genetic algorithms,” Sol. Energy Mater. Sol. Cells 92(12), 1689–1696 (2008), http://dx.doi.org/10.1016/j.solmat.2008.07.021 .
[Crossref]

P. G. O’Brien, N. P. Kherani, A. Chutinan, G. A. Ozin, S. John, and S. Zukotynski, “Silicon Photovoltaics Using Conducting Photonic Crystal Back-Reflectors,” Adv. Mater. (Deerfield Beach Fla.) 20(8), 1577–1582 (2008), http://dx.doi.org/10.1002/adma.200702219 .
[Crossref]

L. Zeng, P. Bermel, Y. Yi, B. A. Alamariu, K. A. Broderick, J. Liu, C. Hong, X. Duan, J. D. Joannopoulos, and L. C. Kimerling, “Demonstration of enhanced absorption in thin film Si solar cells with textured photonic crystal back reflector,” Appl. Phys. Lett. 93(22), 221105 (2008), http://link.aip.org/link/doi/10.1063/1.3039787 .
[Crossref]

2007 (2)

C. Haase and H. Stiebig, “Thin-film silicon solar cells with efficient periodic light trapping texture,” Appl. Phys. Lett. 91(6), 061116–061119 (2007), http://link.aip.org/link/doi/10.1063/1.2768882 .
[Crossref]

P. Bermel, C. Luo, L. Zeng, L. C. Kimerling, and J. D. Joannopoulos, “Improving thin-film crystalline silicon solar cell efficiencies with photonic crystals,” Opt. Express 15(25), 16986–17000 (2007), http://www.opticsinfobase.org/abstract.cfm?URI=oe-15-25-16986 .
[Crossref] [PubMed]

2006 (1)

L. Zeng, Y. Yi, C. Hong, J. Liu, N. Feng, X. Duan, L. C. Kimerling, and B. A. Alamariu, “Efficiency enhancement in Si solar cells by textured photonic crystal back reflector,” Appl. Phys. Lett. 89(11), 111111 (2006), http://link.aip.org/link/doi/10.1063/1.2349845 .
[Crossref]

2005 (2)

C. Y. Kao, S. Osher, and E. Yablonovitch, “Maximizing band gaps in two-dimensional photonic crystals by using level set methods,” Appl. Phys. B 81(2-3), 235–244 (2005), http://dx.doi.org/10.1007/s00340-005-1877-3 .
[Crossref]

W. R. Frei, D. A. Tortorelli, and H. T. Johnson, “Topology optimization of a photonic crystal waveguide termination to maximize directional emission,” Appl. Phys. Lett. 86(11), 111114 (2005), http://link.aip.org/link/doi/10.1063/1.1885170 .
[Crossref]

2004 (1)

P. Borel, A. Harpøth, L. Frandsen, M. Kristensen, P. Shi, J. Jensen, and O. Sigmund, “Topology optimization and fabrication of photonic crystal structures,” Opt. Express 12(9), 1996–2001 (2004), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-12-9-1996 .
[Crossref] [PubMed]

1999 (1)

D. C. Dobson and S. J. Cox, “Maximizing Band Gaps in Two-Dimensional Photonic Crystals,” SIAM J. Appl. Math. 59(6), 2108–2120 (1999), http://dx.doi.org/10.1137/S0036139998338455 .
[Crossref]

1998 (1)

M. J. D. Powell, “Direct search algorithms for optimization calculations,” Acta. Numerica 7, 287–336 (1998), http://dx.doi.org/10.1017/S0962492900002841 .
[Crossref]

1997 (1)

H. R. Stuart and D. G. Hall, “Thermodynamic limit to light trapping in thin planar structures,” J. Opt. Soc. Am. A 14(11), 3001–3008 (1997), http://www.opticsinfobase.org/abstract.cfm?URI=josaa-14-11-3001 .
[Crossref]

1995 (1)

C. Heine and R. H. Morf, “Submicrometer gratings for solar energy applications,” Appl. Opt. 34(14), 2476–2482 (1995), http://www.opticsinfobase.org/abstract.cfm?URI=ao-34-14-2476 .
[Crossref] [PubMed]

1992 (1)

K. Sato, Y. Gotoh, Y. Wakayama, Y. Hayasahi, K. Adachi, and H. Nishimura, “Highly textured SnO2:F TCO films for a-Si solar cells,” Rep. Res. Lab. Asahi Glass Co. Ltd. 42, 129–137 (1992).

1983 (1)

P. Sheng, A. N. Bloch, and R. S. Stepleman, “Wavelength-selective absorption enhancement in thin-film solar cells,” Appl. Phys. Lett. 43(6), 579–581 (1983), http://link.aip.org/link/doi/10.1063/1.94432 .
[Crossref]

1982 (1)

E. Yablonovitch, “Statistical ray optics,” J. Opt. Soc. Am. 72(7), 899–907 (1982), http://www.opticsinfobase.org/abstract.cfm?URI=josa-72-7-899 .
[Crossref]

Adachi, K.

K. Sato, Y. Gotoh, Y. Wakayama, Y. Hayasahi, K. Adachi, and H. Nishimura, “Highly textured SnO2:F TCO films for a-Si solar cells,” Rep. Res. Lab. Asahi Glass Co. Ltd. 42, 129–137 (1992).

Agarwal, A.

Agarwal, A. M.

Agrawal, M.

Alamariu, B. A.

Atwater, H. A.

Avniel, Y.

Ballif, C.

Barnett, A.

Bermel, P.

Bloch, A. N.

Borel, P.

Broderick, K. A.

Chen, C.

Chen, G.

Chutinan, A.

Cox, S. J.

D. C. Dobson and S. J. Cox, “Maximizing Band Gaps in Two-Dimensional Photonic Crystals,” SIAM J. Appl. Math. 59(6), 2108–2120 (1999), http://dx.doi.org/10.1137/S0036139998338455 .
[Crossref]

Creazzo, T.

Cui, Y.

Dewan, R.

Dobson, D. C.

D. C. Dobson and S. J. Cox, “Maximizing Band Gaps in Two-Dimensional Photonic Crystals,” SIAM J. Appl. Math. 59(6), 2108–2120 (1999), http://dx.doi.org/10.1137/S0036139998338455 .
[Crossref]

Duan, X.

Fan, S.

Z. Yu and S. Fan, “Angular constraint on light-trapping absorption enhancement in solar cells,” Appl. Phys. Lett. 98(1), 011106 (2011), http://link.aip.org/link/doi/10.1063/1.3532099 .
[Crossref]

Feng, N.

Ferry, V. E.

Frandsen, L.

Frei, W. R.

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Fig. 1 (left) Schematic device structure for a thin-film Si solar cell with a textured Si / SiO₂ interface. The averaged thicknesses for Si and SiO₂ layers are 1.5 μm and 0.5 μm, respectively. (right) Different types of texture we investigate are symmetric triangular grating, asymmetric sawtooth grating and general periodic structures with Fourier series.

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Fig. 2 (a) Schematic device structure with symmetric triangular grating. (b) Plot of the absorption enhancement factor (F) as a function of the grating period Λ and thickness t. The arrow indicates the optimal parameters. (c) Absorption spectrum of the optimal structure (Λ = 920 nm and t = 520 nm), obtaining F = 1.26πn.

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Fig. 3 (a) Schematic device structure with asymmetric sawtooth grating. (b) Plot of the absorption enhancement factor (F) as a function of the grating period Λ and thickness t. The arrow indicates the optimal parameters. (c) Absorption spectrum of the optimal structure (Λ = 920 nm and t = 240 nm), obtaining F = 2.04πn.

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Fig. 4 Summary of the calculated maximum enhancement factors F in Section 3 and comparison with Yu’s model in Ref [24]. and commercial Asahi glass. The insets indicate the structures with the best performance achieved in our optimizations. (a) Asymmetric structures. (b) Symmetric structures.

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Fig. 5 Angular dependence of the optimized asymmetric structures obtained in Fig. 4a.

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Tables (1)

Table 1 Optimized Structural Parameters For Asymmetric Structures, With F = 2.70πn. The Units For A ₁, B ₁, A ₂, B ₂ … t _ox And Λ Are nm. B ₅ Is Set To A Constant 0.

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Equations (6)

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F = \frac{\frac{1}{λ_{2} - λ_{1}} \int_{λ_{1}}^{λ_{2}} A (λ) d λ}{α d},

H (x) = 500 + \sum_{n = 1}^{\infty} (A_{n} \sin (\frac{2 π n}{Λ} x) + B_{n} \cos (\frac{2 π n}{Λ} x)),

F = F (A_{1}, B_{1}, A_{2}, B_{2}, ..., Λ) .

F (Λ) = \frac{1}{λ_{2} - λ_{1}} \int_{λ_{1}}^{λ_{2}} (\frac{\frac{Λ}{λ}}{⌊ \frac{Λ}{λ} ⌋ + \frac{1}{2}}) d λ \cdot π n for asymmetric structures

F (Λ) = \frac{1}{λ_{2} - λ_{1}} \int_{λ_{1}}^{λ_{2}} (\frac{\frac{Λ}{λ}}{⌊ \frac{Λ}{λ} ⌋ + 1}) d λ \cdot π n for symmetric structures

F_{a v g} = \frac{1}{2} \int_{- \frac{π}{2}}^{\frac{π}{2}} F (θ) \cos θ d θ