Sub-1.4eV bandgap inorganic perovskite solar cells with long-term stability

Mingyu Hu, Min Chen, Peijun Guo, Hua Zhou, Junjing Deng, Yudong Yao, Yi Jiang, Jue Gong, Zhenghong Dai, Yunxuan Zhou, Feng Qian, Xiaoyu Chong, Jing Feng (), Richard D. Schaller, Kai Zhu, Nitin P. Padture () and Yuanyuan Zhou ()
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Mingyu Hu: Kunming University of Science and Technology
Min Chen: Brown University
Peijun Guo: Argonne National Laboratory
Hua Zhou: Argonne National Laboratory
Junjing Deng: Argonne National Laboratory
Yudong Yao: Argonne National Laboratory
Yi Jiang: Argonne National Laboratory
Jue Gong: Brown University
Zhenghong Dai: Brown University
Yunxuan Zhou: Kunming University of Science and Technology
Feng Qian: Kunming University of Science and Technology
Xiaoyu Chong: Kunming University of Science and Technology
Jing Feng: Kunming University of Science and Technology
Richard D. Schaller: Argonne National Laboratory
Kai Zhu: National Renewable Energy Laboratory
Nitin P. Padture: Brown University
Yuanyuan Zhou: Brown University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract State-of-the-art halide perovskite solar cells have bandgaps larger than 1.45 eV, which restricts their potential for realizing the Shockley-Queisser limit. Previous search for low-bandgap (1.2 to 1.4 eV) halide perovskites has resulted in several candidates, but all are hybrid organic-inorganic compositions, raising potential concern regarding device stability. Here we show the promise of an inorganic low-bandgap (1.38 eV) CsPb0.6Sn0.4I3 perovskite stabilized via interface functionalization. Device efficiency up to 13.37% is demonstrated. The device shows high operational stability under one-sun-intensity illumination, with T80 and T70 lifetimes of 653 h and 1045 h, respectively (T80 and T70 represent efficiency decays to 80% and 70% of the initial value, respectively), and long-term shelf stability under nitrogen atmosphere. Controlled exposure of the device to ambient atmosphere during a long-term (1000 h) test does not degrade the efficiency. These findings point to a promising direction for achieving low-bandgap perovskite solar cells with high stability.

Date: 2020
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DOI: 10.1038/s41467-019-13908-6

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