Thin film solar cell design based on photonic crystal and diffractive grating structures.

In this paper we present novel light trapping designs applied to multiple junction thin film solar cells. The new designs incorporate one dimensional photonic crystals as band pass filters that reflect short light wavelengths (400 - 867 nm) and transmit longer wavelengths(867 -1800 nm) at the interface between two adjacent cells. In addition, nano structured diffractive gratings that cut into the photonic crystal layers are incorporated to redirect incoming waves and hence increase the optical path length of light within the solar cells. Two designs based on the nano structured gratings that have been realized using the scattering matrix and particle swarm optimization methods are presented. We also show preliminary fabrication results of the proposed devices.

[1]  Peter Bermel,et al.  Improving thin-film crystalline silicon solar cell efficiencies with photonic crystals. , 2007, Optics express.

[2]  J. Michel,et al.  Design of Highly Efficient Light-Trapping Structures for Thin-Film Crystalline Silicon Solar Cells , 2007, IEEE Transactions on Electron Devices.

[3]  Yasha Yi,et al.  Efficiency enhancement in Si solar cells by textured photonic crystal back reflector , 2006 .

[4]  Steve Hegedus,et al.  Thin film solar modules: the low cost, high throughput and versatile alternative to Si wafers , 2006 .

[5]  S. Kurtz,et al.  50% Efficient Solar Cell Architectures and Designs , 2006, 2006 IEEE 4th World Conference on Photovoltaic Energy Conference.

[6]  Sriram Venkataraman,et al.  Fabrication of two-dimensional and three-dimensional photonic crystal devices for applications in chip-scale optical interconnects , 2006 .

[7]  Yaojiang Zhang,et al.  Analysis of finite-size coated electromagnetic bandgap structure by an efficient scattering matrix method , 2005 .

[8]  L. Kimerling,et al.  New Solar Cells with Novel Light Trapping via Textured Photonic Crystal Back Reflector , 2005 .

[9]  J. Springer,et al.  TCO and light trapping in silicon thin film solar cells , 2004 .

[10]  A. Shah,et al.  Thin‐film silicon solar cell technology , 2004 .

[11]  A. Leo,et al.  Texturing industrial multicrystalline silicon solar cells , 2004 .

[12]  J. Gee.  Optically enhanced absorption in thin silicon layers using photonic crystals , 2002, Conference Record of the Twenty-Ninth IEEE Photovoltaic Specialists Conference, 2002..

[13]  Yuhui Shi,et al.  Particle swarm optimization: developments, applications and resources , 2001, Proceedings of the 2001 Congress on Evolutionary Computation (IEEE Cat. No.01TH8546).

[14]  Andrew Blakers,et al.  A review of thin-film crystalline silicon for solar cell applications. Part 2: Foreign substrates , 2001 .

[15]  T. Baba,et al.  Analysis of finite 2D photonic crystals of columns and lightwave devices using the scattering matrix method , 1999 .

[16]  M. Green,et al.  19.8% efficient “honeycomb” textured multicrystalline and 24.4% monocrystalline silicon solar cells , 1998 .

[17]  Russell C. Eberhart,et al.  A new optimizer using particle swarm theory , 1995, MHS'95. Proceedings of the Sixth International Symposium on Micro Machine and Human Science.

[18]  R. Morf,et al.  Submicrometer gratings for solar energy applications. , 1995, Applied optics.

[19]  J. C. Inkson,et al.  Scattering matrix theory of transport in heterostructures , 1986 .

[20]  G. Cody,et al.  Intensity enhancement in textured optical sheets for solar cells , 1982, IEEE Transactions on Electron Devices.