Chiral cation promoted interfacial charge extraction for efficient tin-based perovskite solar cells

作     者：Weiyin Gao He Dong Nan Sun Lingfeng Chao Wei Hui Qi Wei Hai Li Yingdong Xia Xingyu Gao Guichuan Xing Zhongbin Wu Lin Song Peter Müller-Buschbaum Chenxin Ran Yonghua Chen Weiyin Gao;He Dong;Nan Sun;Lingfeng Chao;Wei Hui;Qi Wei;Hai Li;Yingdong Xia;Xingyu Gao;Guichuan Xing;Zhongbin Wu;Lin Song;Peter Müller-Buschbaum;Chenxin Ran;Yonghua Chen

作者机构：Frontiers Science Center for Flexible ElectronicsXi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM)Nanjing Tech University(NanjingTech)Nanjing 211816JiangsuChina Joint Key Laboratory of the Ministry of EducationInstitute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina Shanghai Synchrotron Radiation Facility(SSRF)Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina Lehrstuhl für Funktionelle MaterialienPhysik DepartmentTechnische Universität München.James-Franck-Str.185748 GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ)Technische Universität MünchenLichtenbergstr.185748 GarchingGermany 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第5期

页      面：789-796页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the Natural Science Foundation of China (Grants 51802253, 51972172, 61705102,61904152, and 91833304) the China Postdoctoral Science Foundation (Grant 2021M692630) the Natural Science Basic Research Plan in Shaanxi Province of China (2019JM-326) the Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University (No. 2020GXLH-Z-007) the Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars,China (Grant BK20200034) the Young 1000 Talents Global Recruitment Program of China the Jiangsu Specially Appointed Professor program the “Six talent peaks” Project in Jiangsu Province,China the Fundamental Research Funds for the Central Universities 

主　　题：Tin perovskite Chiral cation 2D/3D structure Interfacial charge extraction Solar cells 

摘      要：Pb-free Sn-based perovskite solar cells(PSCs) have recently made inspiring progress, and power conversion efficiency(PCE) of 14.8% has been achieved. However, due to the energy-level mismatch and poor interfacial contact between commonly used hole transport layer(i.e., poly(3,4-ethylenedioxythio phene):poly(styrene sulfonate), PEDOT:PSS) and FASnI_(3) film, it is still challenging to effectively extract holes at the interface. Owing to the p-type nature of Sn-based perovskites, the efficient hole extraction is of particular significance to improve the PCE of their solar cells. In this work, for the first time, the role of chiral cations, a-methylbenzylamine(S-/R-/rac-MBA), in promoting hole transportation of FASnI_(3)-based PSCs is demonstrated. The introduction of MBAs is found to form 2D/3D film with lowdimensional structures locating at PEDOT:PSS/FASnI_(3) interface, which facilitates the energy level alignment and efficient charge transfer at the interface. Importantly, chiral-induced spin selectivity(CISS)effect of R-MBA_(2)SnI_(4)induced by chiral R-MBA cation is found to further assist the specific interfacial transport of accumulated holes. As a result, R-MBA-based PSCs achieve decent PCE of 10.73% with much suppressed hysteresis and enhanced device stability. This work opens up a new strategy to efficiently promote the interfacial extraction of accumulated charges in working PSCs.