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

查看全文 作　　者：Shaobing [1]Xiong;Tianyu [2]Hao;Yuyun [1]Sun;Jianming [1]Yang;Ruru [1]Ma;Jiulong [1]Wang;Shijing [1,3]Gong;Xianjie [4]Liu;Liming [6]Ding;Mats [4,5]Fahlman;Qinye [1,3,4]Bao

机构地区：[1]Key Laboratory of Polar Materials and Devices,Department of Electronic Science,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China;[2]School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200025,China;[3]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,Shanxi,China;[4]Laboratory of Organic Electronics,ITN,Linköping University,SE-60174 Norrköping,Sweden;[5]Wallenberg Wood Science Center,Linköping University,SE-60174 Norrköping,Sweden;[6]Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China

出　　处：《Journal of Energy Chemistry》索引2021年第30卷第4期,共7页

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。 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. 关键词：Perovskite solar cells Defect passivation Nontoxic biomaterial EFFICIENCY

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

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