Defect passivation by nontoxic biomaterial yields 21% efficiency perovskite solar cells

作     者：Shaobing Xiong Tianyu Hao Yuyun Sun Jianming Yang Ruru Ma Jiulong Wang Shijing Gong Xianjie Liu Liming Ding Mats Fahlman Qinye Bao Shaobing Xiong;Tianyu Hao;Yuyun Sun;Jianming Yang;Ruru Ma;Jiulong Wang;Shijing Gong;Xianjie Liu;Liming Ding;Mats Fahlman;Qinye Bao

作者机构：Key Laboratory of Polar Materials and DevicesDepartment of Electronic ScienceSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200025China Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006ShanxiChina Laboratory of Organic ElectronicsITNLinköping UniversitySE-60174 NorrköpingSweden Wallenberg Wood Science CenterLinköping UniversitySE-60174 NorrköpingSweden Center for Excellence in Nanoscience(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China 

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

年 卷 期：2021年第30卷第4期

页      面：265-271页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 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] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(21875067,51811530011,11604099) the Fundamental Research Funds for the Central Universities,Shanghai Rising-Star(19QA1403100) ECNU Multifunctional Platform for Innovation(006) 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：Perovskite solar cells Defect passivation Nontoxic biomaterial Efficiency 

摘      要：Defect passivation is one of the most important strategies to boost both the efficiency and stability of perovskite solar cells(PSCs).Here,nontoxic and sustainable forest-based biomaterial,betulin,is first introduced into perovskites.The experiments and calculations reveal that betulin can effectively passivate the uncoordinated lead ions in perovskites via sharing the lone pair electrons of hydroxyl group,promoting charge transport.As a result,the power conversion efficiencies of the p-i-n planar PSCs remarkably increase from 19.14%to 21.15%,with the improvement of other parameters.The hydrogen bonds of betulin lock methylamine and halogen ions along the grain boundaries and on the film surface and thus suppress ion migration,further stabilizing perovskite crystal structures.These positive effects enable the PSCs to maintain 90%of the initial efficiency after 30 days in ambient air with 60%±5%relative humidity,75%after 300 h aging at 85℃,and 55%after 250 h light soaking,respectively.This work opens a new pathway for using nontoxic and low-cost biomaterials from forest to make highly efficient and stable PSCs.