Cs-content-dependent organic cation exchange in FA1-xCsxPbI3 perovskite

作     者：Meng Ren Jielin Shi Yuetian Chen Yanfeng Miao Yixin Zhao Meng Ren;Jielin Shi;Yuetian Chen;Yanfeng Miao;Yixin Zhao

作者机构：School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第9期

页      面：539-544,I0015页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Key Research and Development Program of China(2017YFE0127100) the National Natural Science Foundation of China(NSFC,Grant 22025505) the Program of Shanghai Academic Technology Research Leader(Grant 20XD1422200) the Key Laboratory of Resource Chemistry,Ministry of Education(KLRC_ME2003) 

主　　题：FA-Cs mixed-cation perovskite Cation exchange 2D PEA2PbI4 Surface termination 

摘      要：FA-Cs mixed-cation perovskite has been reported as a promising candidate for obtaining highly efficient and stable photovoltaic *** iodide(PEAI)post-treatment is a widely used and effective method for surface passivation of FA-Cs perovskite layer in ***,it is still controversial whether the PEAI post-treatment would form two-dimensional(2D)perovskite PEA_(2)PbI_(4) capping layer or just result in PEA+terminated *** in this work,the function of PEAI post-treatment on FA-Cs mixed-cation perovskite FA_(1-x)Cs_(x)PbI_(3)(x=0.1–0.9)with varied Cs contents is *** increased Cs content,the FA-Cs perovskite shows higher resistance to the cation exchange between FA+and PEA+.This Cs-content-dependent cation exchange results in the different PEAI reaction preferences with FA-Cs mixed-cation ***,higher Cs content with stronger resistance to cation exchange reaction leads to a wider processing window for post-treatment and defect passivation,which is beneficial for the fabrication of large-scale photovoltaic devices.