Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (9): 20230182.doi: 10.7503/cjcu20230182

• Article • Previous Articles     Next Articles

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)

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

CLC Number: 

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