Crystallization management of CsPbI2Br perovskites by PbAc2-incorporated twice spin-coating process for efficient and stable CsPbI2Br perovskite solar cells

作     者：Yu Liu Kun Lang Huifang Han Huijing Liu Yao Fu Pengchen Zou Yinhui Lyu Jia Xu Jianxi Yao 

作者机构：State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing Key Laboratory of Energy Safety and Clean Utilization North China Electric Power University 

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

年 卷 期：2024年第97卷第10期

页      面：419-428页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0817[工学-化学工程与技术] 08[工学] 080501[工学-材料物理与化学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (U22A20142) the Fundamental Research Funds for the Central Universities (2023JC007) 

主　　题：Crystallization management CsPbI₂Br PbAc₂ Perovskite solar cells Twice spin-coating process 

摘      要：CsPbI2Br perovskite solar cell has been extensively studied due to its exceptional thermal stability and relatively stable perovskite phase ***,the presence of bromine leads to a rapid crystallization rate of CsPbI2Br films,resulting in small grain size and high defect ***,CsPbI2Br demonstrates poor light absorption due to its wide ***,it is crucial to control the crystallization rate and increase the film thickness to reduce defect density,enhance light absorption,and improve photovoltaic *** this study,we utilized a PbAc2-incorporated twice spincoating（PTS） process to address these ***,PbAc2was added to the CsPbI2Br precursor solution to form a CsPbI2Br film,which was then coated with the CsPbI2Br precursor solution to produce the PTS film,Ac-can delay the perovskite crystallization,leading to the formation of thicker and denser CsPbI2Br ***,lone-pair electrons of the oxygen atom provided by Ac-formed coordination bonds with under-coordinated Pb2+ions to fill halogen ion vacancies,thereby reducing the defect ***,the PTS CsPbI2Br device achieved a peak power conversion efficiency（PCE） of 16.19% and maintained 96.7% of its initial PCE over 1500 h at room temperature under 25% relative humidity without any encapsulation.