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Realization of Significant Absorption Enhancement in Thin Film Silicon Solar Cells with Textured Photonic Crystal Backside Reflector

  • Lirong Zeng (a1), Peter Bermel (a1), Yasha Yi (a1), Bernard A. Alamariu (a1), Kurt A. Broderick (a1), Jifeng Liu (a1), Ching-yin Hong (a1), Xiaoman Duan (a1), John Joannopoulos (a1) and Lionel C. Kimerling (a1)...
Abstract
Abstract

The major factor limiting the efficiencies of thin film Si solar cells is their weak absorption of red and near-infrared photons due to short optical path length and indirect bandgap. Powerful light trapping is essential to confine light inside the cell for sufficient absorption. Here we report the first experimental application of a new light trapping scheme, the textured photonic crystal (TPC) backside reflector, to monocrystalline thin film Si solar cells. TPC combines a onedimensional photonic crystal, i.e., a distributed Bragg reflector (DBR), with a reflection grating. The near unity reflectivity of DBR in a wide omnidirectional bandgap and the large angle diffraction by the grating ensures a strong enhancement in the absorption of red and near-infrared photons, leading to significant improvements in cell efficiencies. Measured short circuit current density Jsc was increased by 19% for 5 μm thick cells, and 11% for 20 μm thick cells, compared to theoretical predictions of 28% and 14%, respectively.

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1.Green M. A., Silicon Solar Cells, Advanced Principles and Practices (Center for Photovoltaic Devices and Systems, University of New South Wales, Sydney, 1995), p.92.
2.Yablonovitch E. and Cody G., IEEE Trans. Electron Devices ED–29, 300 (1982).
3.Nelson J., The Physics of Solar Cells (Imperial College, London, 2003), pp.279 and 282.
4.Zeng L., Yi Y., Hong C., Liu J., Feng N., Duan X., and Kimerling L. C., Appl Phys. Lett. 89, 111111 (2006).
5.Feng N.-N., Michel J., Zeng L., Liu J., Hong C., Kimerling L. C., and Duan X., IEEE Trans. Electron Devices 54, 1926 (2007).
6.Zeng L., Bermel P., Yi Y., Feng N., Alamariu B. A., Hong C., Duan X., Joannopoulos J., and Kimerling L. C., Mater. Res. Soc. Symp. Proc. 974, CC0206 (2007).
7.Bermel P., Luo C., Zeng L., Kimerling L. C., and Joannopoulos J. D., Opt. Express 15, 16986 (2007).
8.Whittaker D. and Culshaw I., Phys. Rev. B. 60, 2610 (1999).
9.Zeng L., Yi Y., Hong C., Alamariu B. A., Liu J., Duan X., and Kimerling L. C., Mater. Res. Soc. Symp. Proc. 891, 251(2006).
10.Guo L. J., Proc. SPIE 5734, 53 (2005).
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MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
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