Sulfur vs. tellurium: the heteroatom effects on the nonfullerene acceptors

作     者：Lei Yang Linqing Qin Yunxiao Xu Huotian Zhang Lei Lv Kepeng Chen Xinyu Sui Yangguang Zhong Yuan Guo Feng Gao Jianzhang Zhao Yuhao Li Xinfeng Liu Yuanping Yi Xinhui Lu Aidong Peng Hui Huang 

作者机构：College of Materials Science and Optoelectronic Technology Center of Materials Science and Optoelectronics Engineering CAS Center for Excellence in Topological Quantum Computation CAS Key Laboratory of Vacuum Physic University of Chinese Academy of Sciences Beijing 101408 China Department of Chemical Engineering Imperial College London London SW7 24Z United Kingdom Biomolecular and Organic Electronics Department of Physics Chemistry and Biology (IFM) Linkoping University Linkuping SE-58183 Sweden Division of Nanophotonics CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of Physics The Chinese University of Hong Kong Shatin NT 999077 Hong Kong China 

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：897-903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(21774130,21673054) the National Key Research and Development Program of China(2018FYA 0305800) the Key Research Program of Frontier Sciences,CAS(QYZDB-SSW-JSC046) Key Research Program of the Chinese Academy of Sciences(XDPB08-2) the Strategic Priority Research Program of Chinese Academy of Sciences(XDB28000000,XDB12020200) External Cooperation Programs of Chinese Academy of Sciences(211211KYSB20170014) Innovation Program of Aerospace Science and Technology,China Aerospace Science and Technology Corporation One Hundred Talents Program of Chinese Academy of Sciences,and University of Chinese Academy of Sciences,the Ministry of Science and Technology(2017YFA0205004,2016YFA0200700) Beijing Natural Research Foundation(4182076) 

主　　题：heteroatom effects triplet state tellurophene nonfullerene acceptor organic solar cells 

摘      要：The effect of chalcogen heteroatom variation on donor materials has been systematically investigated. However, this effect on acceptors has rarely been explored. Herein, nonfullerene acceptors BFPSP and BFPTP were reported by simply changing the chalcogen atoms from S to Te. The differences between BFPSP and BFPTP in light absorption, energy levels, excited-state lifetimes, energy loss, charge mobilities, morphology, and photovoltaic properties were systematically investigated to understand the heteroatom effects. More importantly, the electroluminescence spectra, external quantum efficiency of photovoltaics and TDDFTcalculations revealed that the triplet excited state(T1) in energy of BFPTP equals to the charge transfer(CT) state in PBDBT:BFPTP, which allows T1 excitons, generated by intersystem crossing, to split into free charges to contribute to the *** contribution provides a strategy for tuning the photophysical properties of nonfullerene acceptors and designing high performance triplet materials for OSCs.