標題: Embedded biomimetic nanostructures for enhanced optical absorption in thin-film solar cells
作者: Tsai, Min-An
Han, Hao-Wei
Tsai, Yu-Lin
Tseng, Ping-Chen
Yu, Peichen
Kuo, Hao-Chung
Shen, Chang-Hong
Shieh, Jia-Min
Lin, Shiuan-Huei
光電系統研究所
電子物理學系
光電工程學系
光電工程研究所
Institute of Photonic System
Department of Electrophysics
Department of Photonics
Institute of EO Enginerring
公開日期: 4-Jul-2011
摘要: Light-management is critical to thin film solar cells due to their usually limited optical absorption in the active layer. Conventional approaches involve employing separate techniques for anti-reflection and light trapping. Here, we demonstrate an embedded biomimetic nanostructure (EBN) that achieves both effects for hydrogenated amorphous silicon (a-Si: H) solar cells. The fabrication of EBNs is accomplished by patterning an index-matching silicon-nitride layer deposited on a glass substrate using polystyrene nanospheres lithography, followed by reactive ion etching. The profile of EBN is then reproduced layer by layer during the deposition of a-Si: H cells. We show that a solar cell with an optimized EBN exhibits a broadband enhanced external quantum efficiency due to both antireflection and light-trapping, with respect to an industrial standard cell using an Asahi U glass substrate which is mostly optimized for light trapping. Overall, the cell with an optimized EBN achieves a large short-circuit current density of 17.74 mA/cm(2), corresponding to a 37.63% enhancement over a flat control cell. The power conversion efficiency is also increased from 5.36% to 8.32%. Moreover, the light management enabled by the EBN remains efficient over a wide range of incident angles up to 60 degrees, which is particularly desirable for real environments with diffused sun light. The novel patterning method is not restricted to a-Si:H solar cells, but is also widely applicable to other thin film materials. (C) 2011 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.19.00A757
http://hdl.handle.net/11536/21692
ISSN: 1094-4087
DOI: 10.1364/OE.19.00A757
期刊: OPTICS EXPRESS
Volume: 19
Issue: 14
起始頁: 0
結束頁: 0
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