Enhancing the efficiency and scalability of perovskite solar cells through pseudo-halide salt addition  

作　　者：Dohun Baek Geon Yeong Park Jeongbeom Cha Hyemi Na Dong Seok Ham Min Kim 

机构地区：[1]School of Chemical Engineering,Future Energy Research Center,Jeonbuk National University,Jeonju 54896,Republic of Korea [2]Graduate School of Integrated Energy-AI,Jeonbuk National University,Jeonju 54896,Republic of Korea [3]Chemical Materials Solutions Center,Korea Research Institute of Chemical Technology(KRICT),Daejeon 34114,Republic of Korea

出　　处：《Journal of Materials Science & Technology》2023年第34期161-169,共9页材料科学技术（英文版）

基　　金：the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.2021R1C1C1012188),(No.2022M3J7A1066428);KK2352-20 funded by the Development of Platform Technology for Industrial Support based on Public-Infra.

摘　　要：Organic-inorganic halide perovskites have significant potential for application in next-generation solar cells.However,their applications are limited by challenges associated with large-area processability and long-term stability owing to the presence of pinholes and defect sites.Here,we incorporated cesium formate in a perovskite active layer using a sequential perovskite fabrication process to eliminate the defect sites of perovskites and improve the film processability via roll-to-roll(R2R)processing.The addition of cesium formate salt to the PbI2 layer influences the perovskite crystal formation behavior as well as increases the perovskite crystallinity and decreases the defect density.Furthermore,cesium formate addition eliminated small PbI2 grains and smoothed the perovskite surface,resulting in a large crystal grain size.The formate ions interact with the PbI2 component and passivate halide vacancy defects,reducing nonradiative recombination and improving charge transfer.Additionally,the treated perovskite films were highly stable in air,exhibiting improved efficiency retention over time and achieving a power conversion efficiency(PCE)of>22%compared to the control.Furthermore,the additive-treated perovskite film was processed using the R2R method,achieving a high PCE of>14%with minimal hysteresis.

关 键 词：Perovskite Solar Cells Pseudo-halide ion Stability Roll-to-roll process 

分 类 号：TM914.4[电气工程—电力电子与电力传动]