Hydrothermal deposition of antimony selenosulfide thin films enables solar cells with 10% efficiency

Rongfeng Tang, Xiaomin Wang, Weitao Lian, Jialiang Huang, Qi Wei, Menglin Huang, Yiwei Yin, Chenhui Jiang, Shangfeng Yang, Guichuan Xing, Shiyou Chen, Changfei Zhu (), Xiaojing Hao (), Martin A. Green and Tao Chen ()
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Rongfeng Tang: University of Science and Technology of China
Xiaomin Wang: University of Science and Technology of China
Weitao Lian: University of Science and Technology of China
Jialiang Huang: University of New South Wales
Qi Wei: University of Macau, Avenida da Universidade
Yiwei Yin: University of Science and Technology of China
Chenhui Jiang: University of Science and Technology of China
Shangfeng Yang: University of Science and Technology of China
Guichuan Xing: University of Macau, Avenida da Universidade
Shiyou Chen: East China Normal University
Changfei Zhu: University of Science and Technology of China
Xiaojing Hao: University of New South Wales
Martin A. Green: University of New South Wales
Tao Chen: University of Science and Technology of China

Nature Energy, 2020, vol. 5, issue 8, 587-595

Abstract: Abstract Antimony selenosulfide, Sb2(S,Se)3, has attracted attention over the last few years as a light-harvesting material for photovoltaic technology owing to its phase stability, earth abundancy and low toxicity. However, the lack of a suitable material processing approach to obtain Sb2(S,Se)3 films with optimal optoelectronic properties and morphology severely hampers prospects for efficiency improvement. Here we demonstrate a hydrothermal approach to deposit high-quality Sb2(S,Se)3 films. By varying the Se/S ratio and the temperature of the post-deposition annealing, we improve the film morphology, increase the grain size and reduce the number of defects. In particular, we find that increasing the Se/S ratio leads to a favourable orientation of the (Sb4S(e)6)n ribbons (S(e) represents S or Se). By optmizing the hydrothermal deposition parameters and subsequent annealing, we report a Sb2(S,Se)3 cell with a certified 10.0% efficiency. This result highlights the potential of Sb2(S,Se)3 as an emerging photovoltaic material.

Date: 2020
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DOI: 10.1038/s41560-020-0652-3

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