Defect suppression and energy level alignment in formamidinium-based perovskite solar cells

作     者：Yi Wang Xiaobing Wang Chenhui Wang Renying Cheng Lanxin Zhao Xu Wang Xuewen Zhang Jingzhi Shang Huang Zhang Lichen Zhao Yongguang Tu Wei Huang Yi Wang;Xiaobing Wang;Chenhui Wang;Renying Cheng;Lanxin Zhao;Xu Wang;Xuewen Zhang;Jingzhi Shang;Huang Zhang;Lichen Zhao;Yongguang Tu;Wei Huang

作者机构：Frontiers Science Center for Flexible ElectronicsXi’an Institute of Flexible Electronics(IFE)&Xi’an Institute of Biomedical Materials and EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Engineering Research Centre of Environment-Friendly Functional MaterialsMinistry of EducationFujian Engineering Research Centre of Green Functional MaterialsHuaqiao UniversityXiamen 361021FujianChina Honors CollegeNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina State Key Laboratory for Artificial Microstructure and Mesoscopic PhysicsSchool of PhysicsFrontiers Science Center for Nano-optoelectronics&Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing 100871China Key Laboratory of Flexible Electronics(KLoFE)&Institution of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Tech UniversityNanjing 211816JiangsuChina Key Laboratory for Organic Electronics&Information Displays(KLOEID)&Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina 

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

年 卷 期：2022年第31卷第4期

页      面：65-72页

核心收录：

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

基　　金：funded by the National Natural Science Foundation of China(62004165) the China Postdoctoral Science Foundation(2020M670036) the Natural Science Foundation of Shaanxi Province,China(2020JQ195) the Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University(2020GXLH-Z-007,2020GXLH-Z-025) the Fundamental Research Funds for the Central Universities 

主　　题：Perovskite solar cells Defect suppression Energy level alignment Phase transition 4-Fluorophenylmethylammonium iodide 

摘      要：The vast majority of high-performance perovskite solar cells(PSCs) are based on a formamidinium lead iodide(FAPbI_(3))-dominant composition. Nevertheless, the FA-based perovskite films suffer from undesirable phase transition and defects-induced non-ideal interfacial recombination, which significantly induces energy loss and hinders the improvement of device performance. Herein, we employed 4-fluorophenylmethylammonium iodide(F-PMAI) to modulate surface structure and energy level alignment of the FA-based perovskite films. The superior optoelectronic films were obtained with reduced trap density, pure α-phase FAPbI_(3) and favorable energy band bending. The lifetime of photogenerated charge carriers increased from 489.3 ns to 1010.6 ns, and a more “p-type perovskite film was obtained by the post-treatment with F-PMAI. Following this strategy, we demonstrated an improved power conversion efficiency of 22.59% for the FA-based PSCs with an open-circuit voltage loss of 399 m V.