Enhanced light trapping based on guided mode resonance effect for thin-film silicon solar cells with two filling-factor gratings

被引：90

作者：

Lee, Yun-Chih ^{[1
]}

Huang, Chian-Fu ^{[1
]}

Chang, Jenq-Yang ^{[1
]}

Wu, Mount-Learn ^{[1
]}

机构：

[1] Natl Cent Univ, Dept Opt & Photon, Chungli 32054, Taiwan

来源：

OPTICS EXPRESS | 2008年 / 16卷 / 11期

关键词：

D O I：

10.1364/OE.16.007969

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

An approach of enhanced light-trapping in a thin-film silicon solar cell by adding a two-filling-factor asymmetric binary grating on it is proposed for the wavelength of near-infrared. Such a grating-on-thin-film structure forms a guided-mode resonance notch filter to couple energy diffracted from an incident wave to a leakage mode of the guided layer in the solar cell. The resonance wave coupled between two-filling-factor gratings would laterally extend the optical power and induce multiple bounces within the active layer. The resonance effect traps light in the cell enhancing its absorption probability. A dynamic light-trapping behaviour in solar cells is observed. A photon dwelling time is proposed for the first time to quantify the light-trapping effect. Moreover, the light absorption probability is also quantified. As compared the grating-on-thin-film structure with the one of planar silicon thin film, simulation results reveal that it is 3-fold enhancement in the light absorption within a spectral range of 920-1040 nm. Moreover, such an enhancement can be maintained even the incident angle of near-IR broadband light wave varies up to +/- 40 degrees. (C) 2008 Optical Society of America.

引用

页码：7969 / 7975

页数：7

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