Reducing surficial and interfacial defects by thiocyanate ionic liquid additive and ammonium formate passivator for efficient and stable perovskite solar cells  

作　　者：Mengfei Zhu Yuren Xia Lina Qin Kaiqiang Zhang Junchuan Liang Cheng Zhao Daocheng Hong Minghang Jiang Xinmei Song Jie Wei Pengbo Zhang Yuxi Tian Zhong Jin 

机构地区：[1]State Key Laboratory of Coordination Chemistry,MOE Key Laboratory of Mesoscopic Chemistry,MOE Key Laboratory of High Performance Polymer Materials and Technology,Jiangsu Key Laboratory of Advanced Organic Materials,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing,Jiangsu 210023,China

出　　处：《Nano Research》2023年第5期6849-6858,共10页纳米研究（英文版）

基　　金：the National Key R&D Program of China(No.2017YFA0208200);the National Natural Science Foundation of China(Nos.22022505,21872069,and 22109069);the Fundamental Research Funds for the Central Universities of China(Nos.020514380266,020514380272,and 020514380274);the Scientific and Technological Innovation Special Fund for Carbon Peak and Carbon Neutrality of Jiangsu Province(BK20220008);the Nanjing International Collaboration Research Program(Nos.202201007 and 2022SX00000955);the Suzhou Gusu Leading Talent Program of Science and Technology Innovation and Entrepreneurship in Wujiang District(No.ZXL2021273).

摘　　要：Organic–inorganic metal halide perovskites have attained extensive attention owing to their outstanding photovoltaic performances,but the existence of numerous defects in crystalline perovskites is still a serious constraint for the further development of perovskite solar cells(PSCs).In particular,the rapid crystallization guided by anti-solvents leads to plenty of surficial and interfacial defects in perovskite films.Herein,we report the adoption of a pseudo-halide anion based ionic liquid additive,1-butyl-3-methylimidazolium thiocyanate(BMIMSCN)for growing ternary cation(CsFAMA,where FA=formamidinium and MA=methylammonium)perovskites with large-scale crystal grains and strong preferential orientation via the enhanced Ostwald ripening.Meanwhile,a novel halide-free passivator,benzylammonium formate(BAFa),was employed as a buffering layer on the perovskite films to suppress surface-dominated charge recombination.As a result,the cooperative effects of BMIMSCN additive and BAFa passivator lead to significant enhancements on fluorescence lifetime(from 79.41 to 201.01 ns),open-circuit voltage(from 1.13 to 1.19 V),photoelectric conversion efficiency(from 18.90%to 22.33%).Moreover,the BMIMSCN/BAFa-CsFAMA PSCs demonstrated greatly improved stability against moisture and heat.This work suggests a promising strategy to improve the quality of perovskite materials via reducing the surficial and interfacial defects by the synergistic effects of lattice doping and interface engineering.

关 键 词：organic–inorganic perovskite solar cells pseudo-halide ion liquid additive non-halide ammonium formate passivator crystalline and interface engineering efficiency and stability improvements 

分 类 号：X53[环境科学与工程—环境工程]