Accelerated Interfacial Charge Transfer in Br-Gradient MAPbI_(3-x)Br_(x) Perovskite Thin Films

作     者：Ye-jun Xiao Jun-xue Liu Jing Leng Bo-ning Wu Shengye Jin 肖晔珺;刘俊学;冷静;吴博宁;金盛烨

作者机构：State Key Laboratory of Molecular Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2021年第34卷第5期

页      面：613-620,I0003页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 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）] 0702[理学-物理学] 

基　　金：financial support from the Ministry of Science and Technology of China(No.2018YFA0208704 and No.2016YFA0200602) the National Natural Science Foundation of China(No.21725305) financial support from the National Natural Science Foundation of China(No.21773237) 

主　　题：Perovskite Charge transfer Halogen gradient Surface treatment 

摘      要：Mixed halide perovskites(MHPs)are a class of semiconductor materials with great promise for many optoelectronic applications due to their outstanding photophysical *** and tailoring the photogenerated carrier dynamics is essential for further improvement of perovskite ***,we report a study about the carrier transport and interfacial charge transfer dynamics in Br-gradient MAPbI_(3-x)Br_(x) perovskite thin films prepared by surface ion-exchange *** by the bandgap gradient in MAPbI_(3-x)Br_(x) films,the accelerated internal hole transport and enhanced interfacial extraction efficiency were both ***,the interfacial electron transfer was also found to be evidently facilitated due to the surface modification during *** findings suggest the possibility of simultaneous acceleration of interfacial electron and hole transfer processes in halide perovskite films via surface post-treatment technique,which is of great importance in further improving the power conversion efficiency of perovskite solar cells.