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Efficient (>20 %) and Stable All‐Inorganic Cesium Lead Triiodide Solar Cell Enabled by Thiocyanate Molten Salts
Author(s) -
Yu Bingcheng,
Shi Jiangjian,
Tan Shan,
Cui Yuqi,
Zhao Wenyan,
Wu Huijue,
Luo Yanhong,
Li Dongmei,
Meng Qingbo
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202102466
Subject(s) - triiodide , thiocyanate , molten salt , solar cell , chemistry , passivation , sodalite , perovskite solar cell , crystallization , inorganic chemistry , caesium , chemical engineering , perovskite (structure) , materials science , crystallography , catalysis , organic chemistry , zeolite , electrolyte , optoelectronics , electrode , layer (electronics) , dye sensitized solar cell , engineering
Besides widely used surface passivation, engineering the film crystallization is an important and more fundamental route to improve the performance of all‐inorganic perovskite solar cells. Herein, we have developed a urea‐ammonium thiocyanate (UAT) molten salt modification strategy to fully release and exploit coordination activities of SCN − to deposit high‐quality CsPbI 3 film for efficient and stable all‐inorganic solar cells. The UAT is derived by the hydrogen bond interactions between urea and NH 4 + from NH 4 SCN. With the UAT, the crystal quality of the CsPbI 3 film has been significantly improved and a long single‐exponential charge recombination lifetime of over 30 ns has been achieved. With these benefits, the cell efficiency has been promoted to over 20 % (steady‐state efficiency of 19.2 %) with excellent operational stability over 1000 h. These results demonstrate a promising development route of the CsPbI 3 related photoelectric devices.