Defect passivation strategy for inorganic CsPbI2Br perovskite solar cell with a high-efficiency of 16.77%  

作　　者：Hua Zhang Jia Zhuang Xingchong Liu Zhu Ma Heng Guo Ronghong Zheng Shuangshuang Zhao Fu Zhang Zheng Xiao Hanyu Wang Haimin Li 

机构地区：[1]School of New Energy and Materials,Southwest Petroleum University,Chengdu,610500,China [2]Institute of Photovoltaic,Southwest Petroleum University,Chengdu,610500,China

出　　处：《Journal of Materials Science & Technology》2021年第23期40-46,共7页材料科学技术（英文版）

基　　金：supported by the National Key R&D Program of China(2016YFB0303602);Sichuan and Technology Program(Grant No.2018JY0015);Yong Science and Technology Innovation Team Project of SWPU(No.2019CXTD04)。

摘　　要：All-inorganic halide perovskite solar cells(PSCs)have acquired great progress,especially CsPbI2Br.However,their photoelectric conversion efficiency(PCE)remains far below the theoretical predictions.Non-radiative recombination is one of the important issues affecting the photoelectric performance of the PSCs,and the defective lead ions derived from the evaporation of halide ions in the inorganic perovskite are the principal non-radiative recombination centers.Herein,the non-radiative recombination is effectively suppressed by introducing the N-methyl-2-pyrrolidone(NMP)as a Lewis base molecule to passivate the defective lead ions.Therefore,by adjusting the dosage of NMP,the smooth and pinhole-free CsPbI_(2)Br perovskite film is obtained and the optimized device exhibits a champion PCE of 16.77%with an excellent fill factor(FF)of 0.80.This work proves the effectiveness of passivation using Lewis base molecules to prevent non-radiative recombination defects in inorganic perovskite.

关 键 词：All-inorganic perovskite CsPbI2Br Defect passivation Pb-O bond High PCE 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]