Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (7): 20230076.doi: 10.7503/cjcu20230076

• Review • Previous Articles     Next Articles

Recent Progress in Non-fused Ring Small-molecule Acceptor Materials

SUN Heng, ZHANG Pengyu, ZHANG Yingnan, ZHAN Chuanlang()   

  1. Key Laboratory of Advanced Materials Chemistry and Devices(AMC&DLab) of the Department of Education ofInner Mongolia Autonomous Region,College of Chemistry and Environmental Science,Inner Mongolia Normal University,Hohhot 010022,China
  • Received:2023-02-20 Online:2023-07-10 Published:2023-03-24
  • Contact: ZHAN Chuanlang E-mail:clzhan@iccas.ac.cn
  • Supported by:
    the Department of Science and Technology of Inner Mongolia, China(2020GG0192);the Natural Science Foundation of Inner Mongolia, China(2022ZD04);the Inner Mongolia Normal University, China(112/1004031962);the Inner Mongolia Autonomous Region Postgraduate Research Innovation Fund, China(S20210274Z)

Abstract:

The invention of non-fullerene acceptors with rigid and fused ring structures has pushed a rapid progress in the field of organic solar cells. The power conversion efficiencies(PCEs) have exceeded 19%. Compared with the fused ring structures, the non-fused ring acceptors have recently received increasing attention due to their relatively simple structures and synthesis. Since 2017, the molecular library of non-fused ring acceptors has extended up to more than 100 molecules and the PCEs have rapidly increased from the initial 4% to the recent 16%. In this review, we classified these molecules into fully non-fused ring acceptors and A-D-C n -D-A type non-fused ring acceptors, according to the non-fused ring backbone structural features. We correlate the molecular structures and the optical, electrochemical and photovoltaic properties from the aspects of non-fused ring backbone structures and side chain engineering. In particular, we focus on that the non-fused ring backbone structures, intramolecular non-covalent interactions and side chain engineering finely tune the materials’ energy levels and bandgaps and photovoltaic performance. We also give suggestions to overcome the factors that limit the increase of solar cell performance.

Key words: Organic solar cell, Non-fullerene, Non-fused ring, Side chain engineering, Non-covalent interaction

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