Fabrication of Photonic Crystal based Back-reflectors for Light Management and Enhanced Absorption in Amorphous Silicon Solar Cells

被引:0
|
作者
Curtin, Benjamin [1 ]
Biswas, Rana [1 ]
Dalal, Vikram [1 ]
机构
[1] Iowa State Univ, Microelect Res Ctr, Dept Elect & Comp Engn, Ames, IA 50011 USA
来源
AMORPHOUS AND POLYCRYSTALLINE THIN FILM SILICON SCIENCE AND TECHNOLOGY - 2009, VOL 1153 | 2009年 / 1153卷
关键词
D O I
10.1557/PROC-1153-A07-15
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Photonic crystal based back-reflectors are an attractive solution for light management and enhancing optical absorption in thin film solar cells, without undesirable losses. We have fabricated prototype photonic crystal back-reflectors using photolithographic methods and reactive-ion etching. The photonic crystal back-reflector has a triangular lattice symmetry, a thickness of 250 nm, and a pitch of 765 nm. Scanning electron microscopy images demonstrate high quality long range periodicity. An a-Si: H solar cell device was grown on this back-reflector using standard PECVD techniques. Measurements demonstrate strong diffraction of light and high diffuse reflectance by the photonic crystal back-reflector. The photonic crystal back-reflector increases the average photon collection by similar to 9% in terms of normalized external quantum efficiency, relative to a reference device on a stainless steel substrate with an Ag coated back surface.
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页数:6
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