Hydrophobic long alkyl chain organic cations induced 2D/3D heterojunction for efficient and stable perovskite solar cells

作     者：Xiang He Min Wang Fengren Cao Wei Tian Liang Li Xiang He;Min Wang;Fengren Cao;Wei Tian;Liang Li

作者机构：School of Physical Science and TechnologyCenter for Energy Conversion Materials and PhysicsJiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第124卷第29期

页      面：243-251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：the National Natural Science Foundation of China(Nos.52025028,52072254,51772197,51872191,52002258) the Natural Science Foundation of Jiangsu Province(No.BK20200877) the Key University Science Research Project of Jiangsu Province(No.21KJA430005) 

主　　题：Hydrophobic 2D/3D perovskite Heterojunction Solar cell Stability 

摘      要：Designing post-formed two-dimensional(2D)perovskite on the surface of three-dimensional(3D)perovskite with matched energy levels and high stability is crucial for improving the performance and stability of perovskite solar cells(PSCs).Herein,a long alkyl chain dodecylammonium bromide(DABr)was applied to react with excessive lead iodide(PbI_(2))on the grain boundary of metal halide perovskite preferentially,forming DA_(2)PbI_(4)(n=1)to constitute a clear 2D/3D *** existence of heterojunction increases the intensity of the built-in electric field of the device to enhance carrier separation and extraction,and the amino group of dodecylammonium cation passivates defects,which jointly contribute to the improvement of the power conversion efficiency(PCE)from 20.35 to 21.81%.The long alkyl chain endows the 2D perovskite with good hydrophobic properties,improving the humidity and thermal stability of the *** unencapsulated device can maintain 64%of its initial efficiency after 1065 h storage in ambient air.