Brominated PEAI as Multi-Functional Passivator for High-Efficiency Perovskite Solar Cell  

作　　者：Minghao Li Junjie Zhou Liguo Tan Yue Liu Siyang Wang Chaofan Jiang Hang Li Xing Zhao Xingyu Gao Wolfgang Tress Liming Ding Chenyi Yi 

机构地区：[1]State Key Laboratory of Power System,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China [2]Shanghai Synchrotron Radiation Facility(SSRF),Shanghai Advanced Research Institute,Chinese Academy of Science,Shanghai 201800,China [3]Institute of Computational Physics,Zurich University of Applied Sciences,Winterthur 8401,Switzerland [4]Center of Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China

出　　处：《Energy & Environmental Materials》2023年第3期50-57,共8页能源与环境材料（英文）

基　　金：supported by the National Natural Science Foundation of China(21872080);State Key Laboratory of Power System and Generation Equipment(No.SKLD21Z03,SKLD20M03);China Postdoctoral Science Foundation(No.043240004).

摘　　要：The interfaces of perovskite solar cells(PSCs)are well known to be rich in deep-level carrier traps,which serve as non-radiative recombination centers and limit the open-circuit voltage(Voc)and power conversion efficiency(PCE)of PSCs.Defect chemistry and surface passivators have been researched extensively and mainly focused on the neutralization of uncoordinated lead or anion defects.Herein,a novel brominated passivator 2-bromophenethylammonium iodide(2-Br-PEAI)is introduced for a multi-functional passivation effect at the perovskite interface.The brominated species readily form 2D perovskite on top of the 3D perovskite and multi-interact with the 3D perovskite surface.Apart from the halide vacancy filling and anion bonding ability,the Br atoms on the benzene ring can interact with the FA cations via strong hydrogen bonding N-H…Br and interact with the[PbI_(6)]^(4−)inorganic framework.The interface defects in the PSCs are well passivated,minimizing non-radiative recombination and enhancing device performance.As a result,a champion PCE of 24.22%was achieved with high V_(oc)and fill factor.In addition,modified devices also showed enhanced operational stability(retention of>95%initial PCE after 400 h)and humidity resistance(>90%initial PCE maintained after 1500 h under~50%RH).

关 键 词：brominated PEAI high efficiency perovskite solar cell surface passivation 

分 类 号：TM914.4[电气工程—电力电子与电力传动]