Diflurobenzothiadiazole core-based noncovalently fused small molecule acceptor exhibiting over 12% efficiency and high fill factor

作     者：Qin Chang Honggang Chen Jun Yuan Yunbin Hu Jiefeng Hai Wei Liu Fangfang Cai Juan Hong Xuxian Xiao Yingping Zou Qin Chang;Honggang Chen;Jun Yuan;Yunbin Hu;Jiefeng Hai;Wei Liu;Fangfang Cai;Juan Hong;Xuxian Xiao;Yingping Zou

作者机构：College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional MaterialsCollege of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004GuangxiChina School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第12期

页      面：7-13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：supported by the National Key Research and Development Program of China (2017YFA0206600) the National Natural Science Foundation of China (21875286) the Science Fund for Distinguished Young Scholars of Hunan Province (2017JJ1029) 

主　　题：Diflurobenzothiadiazole core Noncovalently fused small molecule acceptor High efficiency High fill factor 

摘      要：The versatility and flexibility of organic photoelectric materials endow organic photovoltaic cells fine function modulation and huge commercial potential. In this work, a new noncovalent fused-ring small molecule acceptor(SMA) BID-4 F has been synthesized for high-efficient organic solar cells(OSCs). BID-4 F consists of a diflurobenzothiadiazole(DFBT) core, ladder-like indacenodithiophene(IDT) spacers, and dicyanoindanone electron-withdrawing end groups, which are supposed to be conformationally interlocked by noncovalent interactions, leading to good molecular planarity. In addition, compact solid state stacking was revealed by UV–vis–NIR absorption spectrum. The optimized PM6:BID-4 F based device delivers an eminent power conversion efficiency(PCE) of 12.30% with a high open-circuit voltage(Voc) of 0.92 V and a high fill factor(FF) of 74.3%. Most importantly, the PCE and FF are among one of the highest values reported for the OSCs based on the unfused-ring SMAs. Overall, our work demonstrates that the unfused ring central framework with high molecular planarity through noncovalent interactions provides a good strategy to construct highly efficient SMAs.