Light-induced activation of boron doping in hydrogenated amorphous silicon for over 25% efficiency silicon solar cells

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, Wenjie Zhao, Junlin Du, Xin Song, Jun Yin, Jie Wang, Youlin Yu, Qiang Shi, Zhixin Ma, Haichuan Zhang, Jiajia Ling, Lujia Xu, Jingxuan Kang, Fuzong Xu, Jiang Liu, Hanyuan Liu, Yi Xie, Fanying Meng, Stefaan Wolf, Frédéric Laquai, Zengfeng Di and Zhengxin Liu ()
Additional contact information
Wenzhu Liu: Chinese Academy of Sciences (CAS)
Jianhua Shi: Chinese Academy of Sciences (CAS)
Liping Zhang: Chinese Academy of Sciences (CAS)
Anjun Han: Chinese Academy of Sciences (CAS)
Shenglei Huang: Chinese Academy of Sciences (CAS)
Xiaodong Li: Chinese Academy of Sciences (CAS)
Jun Peng: The Australian National University
Yuhao Yang: Chinese Academy of Sciences (CAS)
Yajun Gao: King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC)
Jian Yu: Southwest Petroleum University
Kai Jiang: Chinese Academy of Sciences (CAS)
Xinbo Yang: Soochow University
Zhenfei Li: Chinese Academy of Sciences (CAS)
Wenjie Zhao: Chinese Academy of Sciences (CAS)
Junlin Du: Chinese Academy of Sciences (CAS)
Xin Song: Changzhou University
Jun Yin: King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC)
Jie Wang: Central South University
Youlin Yu: Chinese Academy of Sciences (CAS)
Qiang Shi: Chinese Academy of Sciences (CAS)
Zhixin Ma: Chinese Academy of Sciences (CAS)
Haichuan Zhang: Zhongwei New Energy (Chengdu) Company
Jiajia Ling: UISEE Technologies (Shanghai) Company
Lujia Xu: King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC)
Jingxuan Kang: King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC)
Fuzong Xu: King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC)
Jiang Liu: King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC)
Hanyuan Liu: Zhongwei New Energy (Chengdu) Company
Yi Xie: Zhongwei New Energy (Chengdu) Company
Fanying Meng: Chinese Academy of Sciences (CAS)
Stefaan Wolf: King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC)
Frédéric Laquai: King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC)
Zengfeng Di: Chinese Academy of Sciences
Zhengxin Liu: Chinese Academy of Sciences (CAS)

Nature Energy, 2022, vol. 7, issue 5, 427-437

Abstract: Abstract Recent achievements in amorphous/crystalline silicon heterojunction (SHJ) solar cells and perovskite/SHJ tandem solar cells place hydrogenated amorphous silicon (a-Si:H) at the forefront of photovoltaics. Due to the extremely low effective doping efficiency of trivalent boron in amorphous tetravalent silicon, light harvesting of aforementioned devices is limited by their fill factors (FFs), a direct metric of the charge carrier transport. It is challenging but crucial to develop highly conductive doped a-Si:H with minimal FF losses. Here we report that light soaking can efficiently boost the dark conductance of boron-doped a-Si:H thin films. Light induces diffusion and hopping of weakly bound hydrogen atoms, which activates boron doping. The effect is reversible and the dark conductivity decreases over time when the solar cell is no longer illuminated. By implementing this effect to SHJ solar cells, we achieved a certified total-area power conversion efficiency of 25.18% with a FF of 85.42% on a 244.63 cm2 wafer.

Date: 2022
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DOI: 10.1038/s41560-022-01018-5

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