高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (9): 20230182.doi: 10.7503/cjcu20230182

• 研究论文 • 上一篇    下一篇

基于芳环取代酰亚胺端基的非富勒烯受体材料的合成与光伏性能

施世领1, 蒋寒曦1, 涂雪杨1, 鲜开虎2, 韩德霞2, 李艳如1, 姚翔1,3(), 叶龙2,4, 费竹平1,3()   

  1. 1.天津大学分子+研究院, 天津市分子光电科学重点实验室, 天津 300072
    2.天津大学材料科学与工程学院, 天津 300350
    3.物质绿色创造与制造海河实验室, 天津 300192
    4.天津市分子光电科学重点实验室, 天津化学化工协同创新中心, 天津 300350
  • 收稿日期:2023-04-08 出版日期:2023-09-10 发布日期:2023-07-11
  • 通讯作者: 姚翔,费竹平 E-mail:yaoxiang@tju.edu.cn;zfei@tju.edu.cn
  • 基金资助:
    国家重点研发计划项目(2018YFA0703200);天津大学自主创新基金(2023XJD-0067)

Synthesis and Photovoltaic Properties of Non-fullerene Acceptors Based on Aryl-substituted Imide End Groups

SHI Shiling1, JIANG Hanxi1, TU Xueyang1, XIAN Kaihu2, HAN Dexia2, LI Yanru1, YAO Xiang1,3(), YE Long2,4, FEI Zhuping1,3()   

  1. 1.Institute of Molecular Plus and Tianjin Key Laboratory of Molecular Optoelectronic Science,Tianjin University,Tianjin 300072,China
    2.School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China
    3.Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China
    4.Tianjin Key Laboratory of Molecular Optoelectronic Science and Collaborative Innovation Center of Chemical Science and Engineering,Tianjin 300350,China
  • Received:2023-04-08 Online:2023-09-10 Published:2023-07-11
  • Contact: YAO Xiang, FEI Zhuping E-mail:yaoxiang@tju.edu.cn;zfei@tju.edu.cn
  • Supported by:
    the National Key Research and Development Program, China(2018YFA0703200);the Seed Foundation of Tianjin University, China(2023XJD-0067)

摘要:

端基结构对于有机太阳能电池(OSCs)中非富勒烯受体(NFAs)的光电性能具有重要影响. 本文设计合成了3种新型芳环取代的酰亚胺结构的端基(IIC-Ph, IIC-PhBr和IIC-Ph2F), 并将其用于制备受体-给体(受体)给体-受体(A-DA′D-A)型NFAs(BTP-IIC-Ph, BTP-IIC-PhBr和BTP-IIC-Ph2F). 紫外-可见-近红外吸收光谱对比和理论模拟结果表明, 相比于IIC-Ph端基, IIC-PhBr和IIC-Ph2F端基具有更强的吸电子能力, 增强了NFAs的分子内电荷转移效应(ICT), 促使了吸收红移. 端基苯环上强吸电子的溴原子和氟原子的引入, 降低了A-DA′D-A型受体的前线轨道能级. 基于BTP-IIC-Ph, BTP-IIC-PhBr和BTP-IIC-Ph2F的二元电池分别获得了13.54%, 11.84%和11.58%的能量转换效率(PCEs). 相比于BTP-IIC-PhBr和BTP-IIC-Ph2F, 基于BTP-IIC-Ph的电池表现出更好的光伏性能, 这主要归因于其较高的最低未占有轨道能级(LUMO)所导致的较高开路电压(VOC), 以及更好的激子解离能力和更弱的陷阱辅助载流子复合.

关键词: 有机太阳能电池, 非富勒烯受体, 端基, 酰亚胺

Abstract:

The structure of end-group is of great significance for the photovoltaic properties of non-fullerene receptors(NFAs) in organic solar cells. We designed and synthesized three novel end groups with aryl-substituted imide structures(IIC-Ph, IIC-PhBr and IIC-Ph2F) and further prepared three NFAs with acceptor-donor(acceptor) donor-acceptor(A-DA'D-A) structure(BTP-IIC-Ph, BTP-IIC-PhBr and BTP-IIC-Ph2F). The comparison of UV-Vis-NIR absorption spectra and theoretical simulation showed that IIC-PhBr and IIC-Ph2F had stronger electron-withdrawing ability than IIC-Ph, which enhanced the intramolecular charge transfer effect of NFAs and red-shift their absorption spectra. The introduction of electron-withdrawing Br and F atoms on the terminal benzene rings of acceptors lowered the frontier molecular orbital energy levels of BTP-IIC-PhBr and BTP-IIC-Ph2F. The power conversion efficiency(PCEs) of solar cell devices based on BTP-IIC-Ph, BTP-IIC-PhBr and BTP-IIC-Ph2F are 13.54%, 11.84%, and 11.58%, respectively. Comparison to BTP-IIC-PhBr and BTP-IIC-Ph2F, BTP-IIC-Ph based devices show higher PCE, which can be attributed to the higher open-circuit voltage(VOC) due to its higher LUMO level, better exciton dissociation and less trap assisted carrier recombination.

Key words: Organic solar cell, Non-fullerene acceptor, End group, Imide

中图分类号: 

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