Improving thin-film crystalline silicon solar cell efficiencies with photonic crystals

被引：572

作者：

Bermel, Peter ^{[1
]}

Luo, Chiyan ^{[1
]}

Zeng, Lirong ^{[2
]}

Kimerling, Lionel C. ^{[2
]}

Joannopoulos, John D. ^{[1
]}

机构：

[1] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA

[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

OPTICS EXPRESS | 2007年 / 15卷 / 25期

关键词：

D O I：

10.1364/OE.15.016986

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Most photovoltaic (solar) cells are made from crystalline silicon (c-Si), which has an indirect band gap. This gives rise to weak absorption of one-third of usable solar photons. Therefore, improved light trapping schemes are needed, particularly for c-Si thin film solar cells. Here, a photonic crystal-based light-trapping approach is analyzed and compared to previous approaches. For a solar cell made of a 2 mu m thin film of c-Si and a 6 bilayer distributed Bragg reflector (DBR) in the back, power generation can be enhanced by a relative amount of 24.0% by adding a 1D grating, 26.3% by replacing the DBR with a six-period triangular photonic crystal made of air holes in silicon, 31.3% by a DBR plus 2D grating, and 26.5% by replacing it with an eight-period inverse opal photonic crystal. (c) 2007 Optical Society of America.

引用

页码：16986 / 17000

页数：15

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