Structure Evolution of Oligomer Fused-Ring Electron Acceptors toward High Efficiency of As-Cast Polymer Solar Cells

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• 作者：Yuze Lin ; Tengfei Li ; Fuwen Zhao ; Lei Han ; Zaiyu Wang ; Yang Wu ; Qiao He ; Jiayu Wang ; Lijun Huo ; Yanming Sun ; Chunru Wang ; Wei Ma and Xiaowei Zhan
• 刊名：Advanced Energy Materials
• 出版年：2016
• 出版时间：September 21, 2016
• 年：2016
• 卷：6
• 期：18
• 全文大小：1521K
• ISSN：1614-6840

文摘

The structure evolution of oligomer fused-ring electron acceptors (FREAs) toward high efficiency of as-cast polymer solar cells (PSCs) is reported. First, a series of FREAs (IC-(1-3)IDT-IC) based on indacenodithiophene (IDT) oligomers as cores are designed and synthesized, effects of IDT number (1–3) on their basic optical and electronic properties are investigated, and more importantly, the relationship between device performance of as-cast PSCs and donor(D)/acceptor(A) matching (absorption, energy level, morphology, and charge transport) of IC-(1-3)IDT-IC acceptors and two representative polymer donors, PTB7-Th and PDBT-T1 is surveyed. Then, the most promising D/A system (PDBT-T1/IC-1IDT-IC) with the best D/A harmony among the six D/A combinations, which yields a power conversion efficiency (PCE) of 7.39%, is found. Finally, changing the side-chains in IC-1IDT-IC from alkylphenyl to alkyl enhances the PCE from 7.39% to 9.20%.