Fundamental limit of light trapping in grating structures

被引：276
作者：
Yu, Zongfu [1 ]
Raman, Aaswath [1 ]
Fan, Shanhui [1 ]
机构：
[1] Stanford Univ, Ginzton Lab, Stanford, CA 94305 USA
来源：
OPTICS EXPRESS | 2010年 / 18卷 / 19期
关键词：
FILM SOLAR-CELLS; OPTICAL-ABSORPTION ENHANCEMENT; PHOTONIC CRYSTALS; SILICON NANOWIRE; PHOTOVOLTAIC APPLICATIONS; DESIGN; ARRAYS; COUPLER;
D O I：
10.1364/OE.18.00A366
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We use a rigorous electromagnetic approach to analyze the fundamental limit of light-trapping enhancement in grating structures. This limit can exceed the bulk limit of 4n(2), but has significant angular dependency. We explicitly show that 2D gratings provide more enhancement than 1D gratings. We also show the effects of the grating profile's symmetry on the absorption enhancement limit. Numerical simulations are applied to support the theory. Our findings provide general guidance for the design of grating structures for light-trapping solar cells. (C) 2010 Optical Society of America
引用
收藏
页码：A366 / A380
页数：15
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