Progress in Physics ›› 2022, Vol. 42 ›› Issue (1): 27-33.doi: 10.13725/j.cnki.pip.2022.01.003

Special Issue: 2023年, 第43卷

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Excited Carrier Dynamics in Organic Photovoltaic Materials with Non-Fullerene Acceptors

ZHANG Sheng-bing1 , ZHANG Chun-feng2   

  1. 1. Tongzhou Senior High School of Jiangsu Province, Nantong, 226300, China 2. School of Physics, Nanjing University, Nanjing, 210093, China
  • Online:2022-02-20 Published:2022-02-22
  • Supported by:

    国家自然科学基金面上项目(No. 91833305, 91850105)。

Abstract: The performance of organic photovoltaic (OPV) device has been improved rapidly benefiting from the development of non-fullerene acceptors (NFAs). In these new systems, the mechanism models developed in conventional OPV systems with fullerene acceptors are not fully valid for describing the generation and recombination processes of photo charges. Here, we summarize recent studies on the excited carrier dynamics using ultrafast spectroscopy. In the model systems, an intra-moiety state arising from the molecule interaction mediates the hole transfer channel, allowing charge separation at a small interfacial driving energy. Moreover, the bimolecular recombination plays an important role in voltage loss in OPV blends with NFAs, which can be strongly suppressed by manipulating the alignment of interfacial and local triplet states. The energy landscape of key levels, susceptible to the molecular interaction, is essential for charge generation and recombination, which can be manipulated for future device optimization.

Key words: non-fullerene acceptors, organic photovoltaic, ultrafast, electron transfer dynamics

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