Highly efficient and thermal stable guanidinium-based two-dimensional perovskite solar cells via partial substitution with hydrophobic ammonium

作     者：Yingzhu Zhang Jiehuan Chen Xiaomei Lian Weitao Yang Jun Li Shuoxun Tian Gang Wu Hongzheng Chen 

作者机构：State Key Laboratory of Silicon Materials Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education)Department of Polymer Science and Engineering Zhejiang University 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2019年第62卷第7期

页      面：859-865页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(51620105006,61721005) Zhejiang Province Natural Science Foundation(LR15E030001) the International Science and Technology Cooperation Program of China(2016YFE0102900) Zhejiang Province Science and Technology Plan(2018C01047) 

主　　题：guanidinium-based 2D perovskite solar cells additive engineering PEA substitution stability 

摘      要：Layered two-dimensional(2D)perovskite solar cells(PVSCs)with a chemical formula of C(NH2)3(CH3NH3)3Pb3I10(n=3)have been fabricated through additive engineering,wherein stoichiometrically equivalent guanidinium(GA+)and methylammonium(MA+)serve as spacer *** crystallinity of the perovskite films is dramatically enhanced with proper amount of methylammonium thiocyanate(MASCN)added into the precursor *** addition,we substitute a small amount of MA+with hydrophobic phenylethylammonium(PEA+),which can passivate trap states of the perovskite *** a result,the open circuit voltage increases to 1.1 V and the best power conversion efficiency(PCE)of 10.12%is ***,superior thermal stability and balanced moisture stability of the PEA-substituted GA-based PVSCs are demonstrated,compared to the popular 3D MAPbI3and 2D PEA-based *** retain approximately 80%of the original PCE after 30 d at 20%relative humidity(RH),and 50%of the original PCE after 3200 min at 85°C without any *** work suggests a new route to achieve both heat and humidity stable PVSCs by simply mixing different spacer cations.