Naphthalene diimide-based cathode interlayer material enables 20.2%efficiency in organic photovoltaic cells  

作　　者：Yue Yu Jianqiu Wang Zhihao Chen Yang Xiao Zhen Fu Tao Zhang Haoyu Yuan Xiao-Tao Hao Long Ye Yong Cui Jianhui Hou 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Physics,State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China [4]Beijing Advanced Innovation Center for Soft Matter Science and Engineering,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China [5]School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China

出　　处：《Science China Chemistry》2024年第12期4194-4201,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(22322904,22275195);financial support from the Youth Innovation Promotion Association Chinese Academy of Sciences(CAS)(2023036);the financial support from China Postdoctoral Science Foundation(CPSF,2022M723199,2024T170943);Postdoctoral Fellowship Program of CPSF(GZB20230772)。

摘　　要：Cathode interlayer(CIL)materials play an important role in improving the power conversion efficiency(PCE)of organic photovoltaic(OPV)cells.However,the current understanding of the structure-property relationship in CIL materials is limited,and systematic studies in this regard are scarce.Here,two new CIL materials,NDI-PhC4 and NDI-Ph C6 were synthesized by varying the alkylamine chain length on the NDI-Ph core.Our investigation reveals a systematic variation in the physical and chemical properties of these materials with increasing alkylamine chain length.Specifically,we observe a sequential decrease in melting point and self-doping effect,accompanied by an enhancement in crystallinity.Among these CIL materials,NDI-PhC4 has a notable balance across various performance metrics.It also exhibits excellent surface modification capabilities,leading to a low surface roughness.Consequently,OPV cells based on NDI-PhC4 achieve a PCE of 20.2%,which is one of the highest reported efficiencies for OPV cells.In addition,the appropriate melting point of NDI-PhC4 contributes to the excellent stability of OPV cells.

关 键 词：organic photovoltaic cells cathode interlayer materials structure-property relationship power conversion efficiency 

分 类 号：TB34[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]