A chemically inert bismuth interlayer enhances long-term stability of inverted perovskite solar cells

Shaohang Wu, Rui Chen, Shasha Zhang, B. Hari Babu, Youfeng Yue, Hongmei Zhu, Zhichun Yang, Chuanliang Chen, Weitao Chen, Yuqian Huang, Shaoying Fang, Tianlun Liu, Liyuan Han () and Wei Chen ()
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Shaohang Wu: Huazhong University of Science and Technology
Rui Chen: Huazhong University of Science and Technology
Shasha Zhang: Huazhong University of Science and Technology
B. Hari Babu: Chinese Academy of Sciences
Youfeng Yue: National Institute of Advanced Industrial Science and Technology (AIST)
Hongmei Zhu: Huazhong University of Science and Technology
Zhichun Yang: Huazhong University of Science and Technology
Chuanliang Chen: Huazhong University of Science and Technology
Weitao Chen: Huazhong University of Science and Technology
Yuqian Huang: Huazhong University of Science and Technology
Shaoying Fang: Huazhong University of Science and Technology
Tianlun Liu: Huazhong University of Science and Technology
Liyuan Han: Shanghai Jiao Tong University
Wei Chen: Huazhong University of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Long-term stability remains a key issue impeding the commercialization of halide perovskite solar cells (HPVKSCs). The diffusion of molecules and ions causes irreversible degradation to photovoltaic device performance. Here, we demonstrate a facile strategy for producing highly stable HPVKSCs by using a thin but compact semimetal Bismuth interlayer. The Bismuth film acts as a robust permeation barrier that both insulates the perovskite from intrusion by undesirable external moisture and protects the metal electrode from iodine corrosion. The Bismuth-interlayer-based devices exhibit greatly improved stability when subjected to humidity, thermal and light stresses. The unencapsulated device retains 88% of its initial efficiency in ambient air in the dark for over 6000 h; the devices maintain 95% and 97% of their initial efficiencies after 85 °C thermal aging and light soaking in nitrogen atmosphere for 500 h, respectively. These sound stability parameters are among the best for planar structured HPVKSCs reported to date.

Date: 2019
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DOI: 10.1038/s41467-019-09167-0

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