End-group modulation of phenazine based non-fullerene acceptors for efficient organic solar cells with high open-circuit voltage  

作　　者：Yahui Zhang Yafeng Li Ruixiang Peng Yi Qiu Jingyu Shi Zhenyu Chen Jinfeng Ge Cuifen Zhang Zheng Tang Ziyi Ge 

机构地区：[1]School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China [2]Zhejiang Business Technology Institute,Ningbo 315012,Zhejiang,China [3]Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,Zhejiang,China [4]Center for Advanced Low-dimension Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China

出　　处：《Journal of Energy Chemistry》2024年第1期461-468,I0011,共9页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (22279152,U21A20331);the National Science Fund for Distinguished Young Scholars (21925506);the Ningbo key scientific and technological project (2022Z117);the Ningbo Natural Science Foundation (2021J192)。

摘　　要：Phenazine-based non-fullerene acceptors(NFAs)have demonstrated great potential in improving the power conversion efficiency(PCE)of organic solar cells(OSCs).Halogenation is known to be an effective strategy for increasing optical absorption,refining energy levels,and improving molecular packing in organic semiconductors.Herein,a series of NFAs(Pz IC-4H,Pz IC-4F,Pz IC-4Cl,Pz IC-2Br)with phenazine as the central core and with/without halogen-substituted(dicyanomethylidene)-indan-1-one(IC)as the electron-accepting end group were synthesized,and the effect of end group matched phenazine central unit on the photovoltaic performance was systematically studied.Synergetic photophysical and morphological analyses revealed that the PM6:Pz IC-4F blend involves efficient exciton dissociation,higher charge collection and transfer rates,better crystallinity,and optimal phase separation.Therefore,OSCs based on PM6:Pz IC-4F as the active layer exhibited a PCE of 16.48%with an open circuit voltage(Voc)and energy loss of 0.880 V and 0.53 e V,respectively.Accordingly,this work demonstrated a promising approach by designing phenazine-based NFAs for achieving high-performance OSCs.

关 键 词：Organic solar cells Non-fullerene acceptor PHENAZINE Central core End group 

分 类 号：TM914.4[电气工程—电力电子与电力传动]