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Aggregation promotes charge separation in fullerene-indacenodithiophene dyad

Author

Listed:
  • Chong Wang

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Bo Wu

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yang Li

    (Beijing University of Posts and Telecommunications (BUPT))

  • Shen Zhou

    (National University of Defense Technology)

  • Conghui Wu

    (South China University of Technology)

  • Tianyang Dong

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences)

  • Ying Jiang

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Zihui Hua

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yupeng Song

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Wei Wen

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences)

  • Jianxin Tian

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yongqiang Chai

    (Friedrich-Alexander-Universität Erlangen-Nürnberg)

  • Rui Wen

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Chunru Wang

    (Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

Abstract

Fast photoinduced charge separation (CS) and long-lived charge-separated state (CSS) in small-molecules facilitate light-energy conversion, while simultaneous attainment of both remains challenging. Here we accomplish this through aggregation based on fullerene-indacenodithiophene dyads. Transient absorption spectroscopy reveals that, compared to solution, the CS time in aggregates is accelerated from 41.5 ps to 0.4 ps, and the CSS lifetime is prolonged from 311.4 ps to 40 μs, indicating that aggregation concomitantly promotes fast CS and long-lived CSS. Fast CS arises from the hot charge-transfer states dissociation, opening up additional resonant channels to free carriers (FCs); subsequently, charge recombination into intramolecular triplet CSS becomes favorable mediated by spin-uncorrelated FCs. Different from fullerene/indacenodithiophene blends, the unique CS mechanism in dyad aggregates reduces the long-lived CSS dependence on molecular order, resulting in a CSS lifetime 200 times longer than blends. This endows the dyad aggregates to exhibit both photoelectronic switch properties and superior photocatalytic capabilities.

Suggested Citation

  • Chong Wang & Bo Wu & Yang Li & Shen Zhou & Conghui Wu & Tianyang Dong & Ying Jiang & Zihui Hua & Yupeng Song & Wei Wen & Jianxin Tian & Yongqiang Chai & Rui Wen & Chunru Wang, 2024. "Aggregation promotes charge separation in fullerene-indacenodithiophene dyad," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50001-z
    DOI: 10.1038/s41467-024-50001-z
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