Efficient and stable tin perovskite solar cells enabled by amorphous-polycrystalline structure

Xiao Liu, Yanbo Wang, Tianhao Wu, Xin He, Xiangyue Meng, Julien Barbaud, Han Chen, Hiroshi Segawa, Xudong Yang () and Liyuan Han ()
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Xiao Liu: Shanghai Jiao Tong University
Yanbo Wang: Shanghai Jiao Tong University
Tianhao Wu: Shanghai Jiao Tong University
Xin He: National Institute for Materials Science
Xiangyue Meng: National Institute for Materials Science
Julien Barbaud: Shanghai Jiao Tong University
Han Chen: Shanghai Jiao Tong University
Hiroshi Segawa: University of Tokyo
Xudong Yang: Shanghai Jiao Tong University
Liyuan Han: Shanghai Jiao Tong University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Tin perovskite solar cells (TPSCs) have triggered intensive research as a promising candidate for lead-free perovskite solar cells. However, it is still challenging to obtain efficient and stable TPSCs because of the low defects formation energy and the oxidation of bivalent tin; Here, we report a TPSC with a stable amorphous-polycrystalline structure, which is composed of a tin triple-halide amorphous layer and cesium-formamidinium tin iodide polycrystals. This structure effectively blocks the outside oxygen, moisture and also suppresses the ion diffusion inside the devices. In addition, its energy level benefits the charge extraction and transport in TPSCs. This design enabled us to obtain the certified quasi-steady-state efficiency over 10% for TPSCs from an accredited certification institute. The cell was stable, maintaining 95% of the initial PCE after operation at the maximum power point under AM 1.5 G simulated solar light (100 mWcm−2) for 1000 hours.

Date: 2020
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DOI: 10.1038/s41467-020-16561-6

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