Over 18% binary organic solar cells enabled by isomerization of non-fullerene acceptors with alkylthiophene side chains

作     者：Ao Shang Siwei Luo Jianquan Zhang Heng Zhao Xinxin Xia Mingao Pan Chao Li Yuzhong Chen Jicheng Yi Xinhui Lu Wei Ma He Yan Huawei Hu 

作者机构：State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of ChemistryGuangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsEnergy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionHong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Department of PhysicsChinese University of Hong KongNew TerritoriesHong Kong 999077China Institute of Polymer Optoelectronic Materials and DevicesState Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China 

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

年 卷 期：2022年第65卷第9期

页      面：1758-1766页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(91433202,52103202) National Key Research and Development Program of China(2019YFA0705900)funded by MOST the Basic and Applied Research Major Program of Guangdong Province(2019B030302007) the Shenzhen Science and Technology Innovation Commission(Shenzhen Fundamental Research Program,JCYJ20200109140801751) the Hong Kong Research Grants Council(RIF project R6021-18,CRF project C6023-19G,GRF project 16310019,16310020) Hong Kong Innovation and Technology Commission(ITCCNERC14SC01)and Foshan-HKUST(FSUST19-CAT0202) the support from Ministry of Science and Technology(2016YFA0200700) NSFC(21704082,21875182,21534003) Key Scientific and Technological Innovation Team Project of Shaanxi Province(2020TD-002) China Postdoctoral Science Foundation(2017M623162) 111 project 2.0(BP2018008) the financial support from Research Grant Council of Hong Kong(14303519) CUHK Direct Grant(4053415) 

主　　题：organic solar cells non-fullerene acceptors side chain isomerization morphology intermolecular interaction 

摘      要：Side-chain engineering has been demonstrated as an effective method for fine-tuning the optical,electrical,and morphological properties of organic semiconductors toward efficient organic solar cells(OSCs).In this work,three isomeric non-fullerene small molecule acceptors(SMAs),named as BTP-4F-T2C8,BTP-4F-T2EH and BTP-4F-T3EH,with linear and branched alkyl chains substituted on the α or β positions of thiophene as the side chains,were synthesized and systematically *** results demonstrate that the size and substitution position of alkyl side chains can greatly affect the electronic properties,molecular packing as well as crystallinity of the *** blending with donor polymer D18-Cl,the prominent device performance of 18.25% was achieved by the BTP-4F-T3EH-based solar cells,which is higher than those of the BTP-4F-T2EH-based(17.41%)and BTP-4F-T2C8-based(15.92%)*** enhanced performance of the BTP-4F-T3EH-based devices is attributed to its stronger crystallinity,higher electron mobility,suppressed bimolecular recombination,and the appropriate intermolecular interaction with the donor *** work reveals that the side chain isomerization strategy can be a practical way in tuning the molecular packing and blend morphology for improving the performance of organic solar cells.