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

Kyohei Nakano, Yujiao Chen, Bo Xiao, Weining Han, Jianming Huang, Hiroyuki Yoshida, Erjun Zhou () and Keisuke Tajima ()
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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
Erjun Zhou: National Center for Nanoscience and Technology
Keisuke Tajima: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-10434-3

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