Abnormal Staebler-Wronski effect of amorphous silicon

Wenzhu Liu; Jianhua Shi; Liping Zhang; Anjun Han; Shenglei Huang; Xiaodong Li; Jun Peng; Yuhao Yang; Yajun Gao; Jian Yu; Kai Jiang; Xinbo Yang; Zhenfei Li; Junlin Du; Xin Song; Youlin Yu; Zhixin Ma; Yubo Yao; Haichuan Zhang; Lujia Xu; Jingxuan Kang; Yi Xie; Hanyuan Liu; Fanying Meng; Frédéric Laquai; Zengfeng Di; Zhengxin Liu

arXiv · 2106.01657

Abnormal Staebler-Wronski effect of amorphous silicon

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Abstract

Great achievements in last five years, such as record-efficient amorphous/crystalline silicon heterojunction (SHJ) solar cells and cutting-edge perovskite/SHJ tandem solar cells, place hydrogenated amorphous silicon (a-Si:H) at the forefront of emerging photovoltaics. Due to the extremely low doping efficiency of trivalent boron (B) in amorphous tetravalent silicon, light harvesting of aforementioned devices are limited by their fill factors (FF), which is a direct metric of the charge carrier transport. It is challenging but crucial to develop highly conductive doped a-Si:H for minimizing the FF losses. Here we report intensive light soaking can efficiently boost the dark conductance of B-doped a-Si:H "thin" films, which is an abnormal Staebler-Wronski effect. By implementing this abnormal effect to SHJ solar cells, we achieve a certificated power conversion efficiency (PCE) of 25.18% (26.05% on designated area) with FF of 85.42% on a 244.63-cm2 wafer. This PCE is one of the highest reported values for total-area "top/rear" contact silicon solar cells. The FF reaches 98.30 per cent of its Shockley-Queisser limit.

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Wenzhu Liu, Jianhua Shi, Liping Zhang, Anjun Han, Shenglei Huang, Xiaodong Li, Jun Peng, Yuhao Yang, Yajun Gao, Jian Yu, Kai Jiang, Xinbo Yang, Zhenfei Li, Junlin Du, Xin Song, Youlin Yu, Zhixin Ma, Yubo Yao, Haichuan Zhang, Lujia Xu, Jingxuan Kang, Yi Xie, Hanyuan Liu, Fanying Meng, Frédéric Laquai, Zengfeng Di, Zhengxin Liu. 2021-06-03. Abnormal Staebler-Wronski effect of amorphous silicon. https://arxiv.org/abs/2106.01657

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