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Open Access Nano Express

Efficiency improvement of silicon solar cells enabled by ZnO nanowhisker array coating

Xuegong Yu, Dong Wang, Dong Lei, Genhu Li and Deren Yang*

Author affiliations

State Key Laboratory of Silicon Materials, Department of Materials Science & Engineering, Zhejiang University, Hangzhou, Zhejiang Province, 310027, Peoples Republic of China

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Citation and License

Nanoscale Research Letters 2012, 7:306  doi:10.1186/1556-276X-7-306

Published: 15 June 2012

Abstract

An efficient antireflection coating is critical for the improvement of silicon solar cell performance via increased light coupling. Here, we have grown well-aligned ZnO nanowhisker (NW) arrays on Czochralski silicon solar cells by a seeding-growth two-step process. It is found that the ZnO NWs have a great effect on the macroscopic antireflection effect and, therefore, improves the solar cell performance. The ZnO NW array-coated solar cells display a broadband reflection suppression from 500 to 1,100 nm, and the minimum reflectance smaller than 3% can easily be achieved. By optimizing the time of ZnO NW growth, it has been confirmed that an increase of 3% relatively in the solar cell efficiency can be obtained. These results are quite interesting for the application of ZnO nanostructure in the fabrication of high-efficiency silicon solar cells.

Keywords:
Silicon; Solar cell; Antireflection; ZnO nanowhisker; Efficiency.