Surface Passivation and Energetic Modification Suppress Nonradiative Recombination in Perovskite Solar Cells

作     者：Wei Dong Wencheng Qiao Shaobing Xiong Jianming Yang Xuelu Wang Liming Ding Yefeng Yao Qinye Bao Wei Dong;Wencheng Qiao;Shaobing Xiong;Jianming Yang;Xuelu Wang;Liming Ding;Yefeng Yao;Qinye Bao

作者机构：Shanghai Key Laboratory of Magnetic ResonanceEast China Normal UniversityShanghai 200241People’s Republic of China School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241People’s Republic of China Center for Excellence in Nanoscience(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People’s Republic of China Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006ShanxiPeople’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2022年第14卷第7期

页      面：32-42页

核心收录：

学科分类：07[理学] 08[工学] 070205[理学-凝聚态物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：supported by the National Science Foundation of China grant(21875067) the Fundamental Research Funds for the Central Universities,Shanghai Rising-Star(19QA1403100) East China Normal University(ECNU)Multifunctional Platform for Innovation The Ministry of Science and Technology of the People’s Republic of China(No.2018YFF01012504) the National Key Research and Development Program of China(2017YFA0206600) the National Natural Science Foundation of China(51773045,21772030,51922032,21961160720)for financial support 

主　　题：Passivation Solid-state NMR Charge transport Perovskite solar cell 

摘      要：Surface passivation via post-treatment is an important strategy for improving power conversion efficiency and operational stability of perovskite solar ***,so far the interaction mechanisms between passivating additive and perovskite are not well ***,we report the atomic-scale interaction of surface passivating additive 2,2-difluoroethylammonium bromine(2FEABr)on the MAPbI_(3).It is found that the bulky 2FEA+cations tend to distribute at film surface,while the Br−anions diffuse from surface into bulk.A combination of 19F,207Pb,and 2H solid-state NMR further reveal the Br−anions’partial substitution for the I−sites,the restricted motion of partial MA+cations,and the firmed perovskite lattices,which would improve charge transport and stability of the perovskite *** spectroscopy and ultraviolet photoelectron spectroscopy demonstrate that the 2FEABr induced surface passivation and energetic modification suppress the nonradiative recombination *** findings enable the efficiency of the p-i-n structured PSC significantly increasing from 19.44 to 21.06%,accompanied by excellent *** work further establishes more knowledge link between passivating additive and PSC performance.