Research Article
Optimization of moth-eye antireflection schemes for silicon solar cells
Stuart A. Boden,
Darren M. Bagnall,
Corresponding Author
Stuart A. Boden
Nano Group, Electronics and Computer Science, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
Nano Group, Electronics and Computer Science, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.===Search for more papers by this authorDarren M. Bagnall
Nano Group, Electronics and Computer Science, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
Search for more papers by this authorStuart A. Boden,
Darren M. Bagnall,
Corresponding Author
Stuart A. Boden
Nano Group, Electronics and Computer Science, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
Nano Group, Electronics and Computer Science, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.===Search for more papers by this authorDarren M. Bagnall
Nano Group, Electronics and Computer Science, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
Search for more papers by this authorAbstract
Nanostructured moth-eye antireflection schemes for silicon solar cells are simulated using rigorous coupled wave analysis and compared to traditional thin film coatings. The design of the moth-eye arrays is optimized for application to a laboratory cell (air–silicon interface) and an encapsulated cell (EVA-silicon interface), and the optimization accounts for the solar spectrum incident on the silicon interface in both cells, and the spectral response of both types of cell. The optimized moth-eye designs are predicted to outperform an optimized double layer thin film coating by approximately 2% for the laboratory cell and approximately 3% for the encapsulated cell. The predicted performance of the silicon moth-eye under encapsulation is particularly remarkable as it exhibits losses of only 0·6% compared to an ideal AR surface. Copyright © 2010 John Wiley & Sons, Ltd.
REFERENCES
- 1 Zhao J, Green MA. Optimized antireflection coatings for high-efficiency silicon solar-cells. IEEE Transactions on Electron Devices 1991; 38(8): 1925–1934.
- 2 Bernhard CG. Structural and functional adaption in a visual system. Endeavour 1967; 26: 79–84.
- 3 Vukusic P, Sambles JR. Photonic structures in biology. Nature 2003; 424(6950): 852–855.
- 4 Wilson SJ, Hutley MC. The optical properties of ‘moth eye’ antireflection surfaces. Opt. Acta 1982; 29(7): 993–1009.
- 5 Huang YF, Chattopadhyay S, Jen Y-J, Peng C-Y, Liu T-A, Hsu Y-K, Pan C-L, Lo H-C, Hsu C-H, Chang Y-H, Lee C-S, Chen K-H, Chen L-C. Improved broadband and quasi-omnidirectional anti-reflection properties with biomimetic silicon nanostructures. Nature Nanotechnology 2007; 2(12): 770–774.
- 6 Enger RC, Case SK. Optical-elements with ultrahigh spatial-frequency surface corrugations. Applied Optics 1983; 22(20): 3220–3228.
- 7 Toyota H, Takahara K, Okano M, Yotsuya T, Kikuta H. Fabrication of microcone array for antireflection structured surface using metal dotted pattern. Japanese Journal of Applied Physics Part 2 2001; 40(7B): L747–L749.
- 8 Clapham PB, Hutley MC. Reduction of lens reflection by moth eye principle. Nature 1973; 244(5414): 281–282.
- 9 Min WL, Betancourt AP, Jiang P, Jiang B. Bioinspired broadband antireflection coatings on GaSb. Applied Physics Letters 2008; 92(14): 141109.
- 10 Kanamori Y, Sasaki M, Hane K. Broadband antireflection gratings fabricated upon silicon substrates. Optics Letters 1999; 24(20): 1422–1424.
- 11 Lalanne P, Morris GM. Antireflection behavior of silicon subwavelength periodic structures for visible light. Nanotechnology 1997; 8(2): 53–56.
- 12 Boden SA, Bagnall DM. Bio-mimetic nanostructured surfaces for near-zero reflection sunrise to sunset, PVSAT-3, Durham, UK, 2007.
- 13 Boden SA, Bagnall DM. Tunable reflection minima of nanostructured antireflective surfaces. Applied Physics Letters 2008; 93: 133108.
- 14 Kanamori Y, Hane K, Sai H, Yugami H. 100 nm period silicon antireflection structures fabricated using porous alumina membrane mask. Applied Physics Letters 2001; 78(2): 142–143.
- 15 Sai H, Fujii H, Kanamori Y, Arafune K, Ohshita Y, Yugami H, Yamaguchi M. Numerical analysis and demonstration of submicron antireflective textures for crystalline silicon solar cells. Proceedings of the IEEE 4th World Conference on Photovoltaic Energy Conversion 2006; Hawaii, 1191–1194.
- 16 Sai H, Fujii H, Arafune K, Ohshita Y, Kanamori Y, Yugami H, Yamaguchi M. Wide-angle antireflection effect of subwavelength structures for solar cells. Japanese Journal of Applied Physics 2007; 46(6A): 3333–3336.
- 17 Koynov S, Brandt MS, Stutzmann M. Black non-reflecting silicon surfaces for solar cells. Applied Physics Letters 2006; 88: 203107.
- 18 Koynov S, Brandt MS, Stutzmann M. Black multi-crystalline silicon solar cells. Physica Status Solidi (Rapid Research Letters) 2007; 1(2): R53–R55.
- 19 Nishioka K, Horita S, Ohdaira K, Matsumura H. Antireflection subwavelength structure of silicon surface formed by wet process using catalysis of single nano-sized gold particle. Solar Energy Materials & Solar Cells 2008; 92: 919–922.
- 20 Sai H, Kanamori Y, Arafune K, Ohshita Y, Yamaguchi M. Light trapping effect of submicron surface textures in crystalline Si solar cells. Progress in Photovoltaics: Research and Applications 2007; 15: 415–423.
- 21 Johnson KC. GD-Calc. 2005; http://software.kjinnovation.com/GD-Calc.html.
- 22 Bird RE, Riordan CJ. Simple solar spectral model for direct and diffuse irradiance on horizontal and tilted planes at the earth's surface for cloudless atmospheres. Journal of Climate and Applied Meteorology 1986; 25(1): 87–97. (http://rredc.nrel.gov/solar/models/ spectral/).
- 23 Boden SA, Bagnall DM. Sunrise to sunset optimization of thin film antireflective coatings for silicon solar cells. Progress in Photovoltaics: Research and Applications 2009; 17: 241–252.
- 24 Wang A, Zhao J, Green MA. 24% efficient silicon solar cells. Applied Physics Letters 1990; 57(6): 602–604.
- 25 Ebong A, Hilali M, Rohatgi A, Meier D, Ruby DS. Belt furnace gettering and passivation for n-web silicon for high-efficiency screen-printed front-surface-field solar cells. Progress in Photovoltaics: Research and Applications 2001; 9: 327–332.
- 26 Papet P, Nichiporuk O, Kaminski A, Rozier Y, Kraiem J, Lelievre J-F, Chaumartin A, Fave A, Lemiti M. Pyramidal texturing of silicon solar cell with TMAH chemical anisotropic etching. Solar Energy Materials and Solar Cells 2006; 90(15): 2319–2328.
- 27 Zhao JH, Wang A, Green MA. 19.8% efficient “honeycomb” textured multicrystalline and 24.4% monocrystalline silicon solar cells. Applied Physics Letters 1998; 73(14): 1991–1993.
- 28 Parretta A, Sarno A, Tortora P, Yakubu H, Maddalena P, Zhao J, Wang A. Angle-dependent reflectance measurements on photovoltaic materials and solar cells. Optics Communications 1999; 172(1–6): 139–151.
- 29 Ting C-J, Chang F-Y, Chen C-F, Chou CP. Fabrication of an antireflective polymer optical film with subwavelength structures using a roll-to-roll micro-replication process. Journal of Micromechanics and Microengineering 2008; 18(7): 075001.
- 30 Boden SA, Bagnal DM. Nanostructured biomimetic moth-eye arrays in silicon by nanoimprint lithography. Proceedings of SPIE 2009; 7401: 74010J.
- 31 Cheung CL, Nikolic RJ, Reinhardt CE, Wang TF. Fabrication of nanopillars by nanosphere lithography. Nanotechnology 2006; 17(5): 1339–1343.
- 32 Sun CH, Jiang P, Jiang B. Broadband moth-eye antireflection coatings on silicon. Applied Physics Letters 2008; 92(6): 061112.
