Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (9): 20230160.doi: 10.7503/cjcu20230160

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Hierarchical Aggregates of Non-fullerene Electron Acceptors

LI Wei1, CHEN Chen1, LIU Dan1, WANG Tao1,2()   

  1. 1.School of Materials Science and Engineering
    2.School of Materials and Microelectronics,Wuhan University of Technology,Wuhan 430070,China
  • Received:2023-04-01 Online:2023-09-10 Published:2023-04-26
  • Contact: WANG Tao E-mail:twang@whut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52273196)

Abstract:

The photoactive layer of organic solar cells is composed of p-type electron donor and n-type electron acceptor. The conjugated structure and hetero-elements within these organic semiconducting molecules make them easy to self-assemble into aggregates, exhibiting distinct optoelectrical properties from those of individual molecules, and further determining the light absorption, exciton dissociation and charge transport processes in their solar cells. In this paper, the aggregation behaviors of n-type non-fullerene electron acceptors(NFAs) at molecular and micro- nano scales were presented, including the stacking, nucleation, crystallization mechanism of the strong-crystalline NFAs as well as their retarding approaches, and the random aggregation as well as ordering strategies for low-order NFAs. Finally, a summary and prospect of the structure design and aggregate control of NFAs were provided, with a special introduction of recent progresses on NFA fibrillization.

Key words: Organic solar cell, Non-fullerene electron acceptor, Molecular aggregate, Optoelectronic property

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