Small bandgap non-fullerene acceptor enables efficient PTB7-Th solar cell with near 0 eV HOMO offset

• 来源期刊: 能源化学
• 年，卷（期）: 2021,（1）
• 页码范围: 60-66
• 页数: 7页
• 语种: 英文

摘要

Three small bandgap non-fullerene(SBG NFAs)acceptors,BDTI,BDTI-2F and BDTI-4F,based on a carbon-oxygen bridged central core and thieno[3,4-b]thiophene linker,end-capped with varied electron-withdrawing terminal groups,were designed and synthesized.The acceptors exhibit strong absorption from 600 nm to 1000 nm.The optimal device incorporating designed NFA and PTB7-Th polymer donor achieves a power conversion efficiency of 9.11％with near 0 eV HOMO offset.The work presents a case study of efficient non-fullerene solar cells with small HOMO offsets,which is achieved by blending PTB7-Th with fine-tuned SBG acceptor.