High open-circuit voltage organic solar cells enabled by a difluorobenzoxadiazole-based conjugated polymer donor

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（7）
• 页码范围: 829-836
• 页数: 8页
• 语种: 英文

摘要

A new polymer donor based on 3,3'-difluoro-2,2'-bithiophene (2F2T) and difluorobenzoxadiazole (ffBX),named 2F2T-ffBX,is designed and synthesized.The organic solar cell (OSC) based on 2F2T-ffBX donor and [6,6]-phenyl-C60-butyl acid methyl ester ([60]PCBM) acceptor exhibits a high efficiency of 7.3％ with a high open-circuit voltage (Voc) of 1.03 V.When blended with perylenediimide-based acceptor (PDI6),the corresponding OSC shows a higher Voc of 1.19 V with a low energy loss of 0.50 eV but a much lower efficiency of 2.0％.The detailed analyses including charge generation,transport,recombination properties,and morphology were performed to understand the performance of corresponding devices.