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Anatomy of the energetic driving force for charge generation in organic solar cells

Author

Listed:
  • Kyohei Nakano

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Yujiao Chen

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Bo Xiao

    (National Center for Nanoscience and Technology)

  • Weining Han

    (Chiba University)

  • Jianming Huang

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Hiroyuki Yoshida

    (Chiba University
    Chiba University)

  • Erjun Zhou

    (National Center for Nanoscience and Technology)

  • Keisuke Tajima

    (RIKEN Center for Emergent Matter Science (CEMS))

Abstract

Eliminating the excess energetic driving force in organic solar cells leads to a smaller energy loss and higher device performance; hence, it is vital to understand the relation between the interfacial energetics and the photoelectric conversion efficiency. In this study, we systematically investigate 16 combinations of four donor polymers and four acceptors in planar heterojunction. The charge generation efficiency and its electric field dependence correlate with the energy difference between the singlet excited state and the interfacial charge transfer state. The threshold energy difference is 0.2 to 0.3 eV, below which the efficiency starts dropping and the charge generation becomes electric field-dependent. In contrast, the charge generation efficiency does not correlate with the energy difference between the charge transfer and the charge-separated states, indicating that the binding of the charge pairs in the charge transfer state is not the determining factor for the charge generation.

Suggested Citation

  • Kyohei Nakano & Yujiao Chen & Bo Xiao & Weining Han & Jianming Huang & Hiroyuki Yoshida & Erjun Zhou & Keisuke Tajima, 2019. "Anatomy of the energetic driving force for charge generation in organic solar cells," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10434-3
    DOI: 10.1038/s41467-019-10434-3
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    Cited by:

    1. Huazhe Liang & Xingqi Bi & Hongbin Chen & Tengfei He & Yi Lin & Yunxin Zhang & Kangqiao Ma & Wanying Feng & Zaifei Ma & Guankui Long & Chenxi Li & Bin Kan & Hongtao Zhang & Oleg A. Rakitin & Xiangjian, 2023. "A rare case of brominated small molecule acceptors for high-efficiency organic solar cells," Nature Communications, Nature, vol. 14(1), pages 1-13, December.

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