Efficient (>20 %) and Stable All‐Inorganic Cesium Lead Triiodide Solar Cell Enabled by Thiocyanate Molten Salts. (6th May 2021)

• Record Type: Journal Article
• Authors: Yu, Bingcheng; Shi, Jiangjian; Tan, Shan; Cui, Yuqi; Zhao, Wenyan; Wu, Huijue; Luo, Yanhong; Li, Dongmei; Meng, Qingbo
• Is Part Of: Angewandte Chemie. Volume 133:Number 24(2021)
• Page Start: 13548
• Page End: 13555
• Publication Date: 2021-05-06
• Subjects: all-inorganic perovskites -- cesium lead triiodide -- molten salts -- solar cell -- thiocyanate; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202102466
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: 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 CsPbI3 film for efficient and stable all‐inorganic solar cells. The UAT is derived by the hydrogen bond interactions between urea and NH4 + from NH4 SCN. With the UAT, the crystal quality of the CsPbI3 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 CsPbI3 related photoelectric devices. Abstract : A new urea‐ammonium thiocyanate (UAT) molten salt was introduced as the additive in all‐inorganic cesium lead triiodide solar cell, as a modification strategy to fully release and exploit coordination activities of SCN − to deposit high‐quality CsPbI3 film. Thus, the UAT‐based devices can provide an encouraging PCE up to 20.08 % with excellent operational stability of over 1000 h.