Defect passivation with potassium trifluoroborate for efficient spray-coated perovskite solar cells in air  

作　　者：Chen Gao Hui Wang Pang Wang Jinlong Cai Yuandong Sun Cong Yu Teng Li Xiaoshuai Zhang Dan Liu Tao Wang 

机构地区：[1]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Semiconductors》2022年第9期25-33,共9页半导体学报（英文版）

基　　金：the National Natural Science Foundation of China(51861145101).

摘　　要：Defects as non-radiative recombination centers hinder the further efficiency improvements of perovskite solar cells(PSCs).Additive engineering has been demonstrated to be an effective method for defect passivation in perovskite films.Here,we employed(4-methoxyphenyl)potassium trifluoroborate(C_(7)H_(7)BF_(3)KO)with and K+functional groups to passivate spray-coated(FAPbI_(3))_(x)(MAPbBr_(3))_(1-x) perovskite and eliminate hysteresis.It is shown that the F of can form hydrogen bonds with the H atom in the amino group of MA+/FA+ions of perovskite,thus reducing the generation of MA+/FA+vacancies and improving device efficiency.Meanwhile,K+and reduced MA+/FA+vacancies can inhibit ion migration,thereby eliminating hysteresis.With the aid of C_(7)H_(7)BF_(3)KO,we obtained hysteresis-free PSCs with the maximum efficiency of 19.5%by spray-coating in air.Our work demonstrates that additive engineering is promising to improve the performance of spray-coated PSCs.

关 键 词：perovskite solar cells spray-coating additive engineering defect passivation hysteresis 

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]