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Light trapping characteristics of glass substrate with hemisphere pit arrays in thin film Si solar cells |
| Chen Le (陈乐)a b, Wang Qing-Kang (王庆康)a, Wangyang Pei-Hua (王阳培华)a, Huang Kun (黄堃)a, Shen Xiang-Qian (沈向前)a |
a Key Laboratory for Thin Film and Micro-fabrication of the Ministry of Education, Department of Microelectronics and Nanoscience, Shanghai Jiao Tong University, Shanghai 200240, China;
b College of Physical Science and Technology Engineering, Guangxi Universities Key Laboratory of Complex System Optimization and Big Data Processing, Yulin Normal University, Yulin 537400, China |
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Abstract In this paper, the light trapping characteristics of glass substrate with hemisphere pit (HP) arrays in thin film Si solar cells are theoretically studied via a numerical approach. It is found that the HP glass substrate has good antireflection properties. Its surface reflectance can be reduced by ～ 50% compared with planar glass. The HP arrays can make the unabsorbed light return to the absorbing layer of solar cells, and the ratio of second absorption approximately equals 30%. Thus, the glass substrate with the hemisphere pit arrays (HP glass) can effectively reduce the total reflectivity of a solar cell from 20% to 13%. The HP glass can also prolong the optical path length. The numerical results show that the total optical path length of the thin film Si solar cell covered with the HP glass increases from 2ω to 4ω. These results are basically consistent with the experimental results.
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Received: 09 August 2014
Revised: 01 November 2014
Accepted manuscript online:
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PACS:
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02.50.-r
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(Probability theory, stochastic processes, and statistics)
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07.60.-j
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(Optical instruments and equipment)
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84.60.Jt
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(Photoelectric conversion)
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88.40.H-
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(Solar cells (photovoltaics))
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| Fund: Project supported by the National High-Tech Research and Development Program of China (Grant No. 2011AA050518). |
Corresponding Authors:
Wang Qing-Kang
E-mail: wangqingkang@sjtu.edu.cn
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Cite this article:
Chen Le (陈乐), Wang Qing-Kang (王庆康), Wangyang Pei-Hua (王阳培华), Huang Kun (黄堃), Shen Xiang-Qian (沈向前) Light trapping characteristics of glass substrate with hemisphere pit arrays in thin film Si solar cells 2015 Chin. Phys. B 24 040202
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