Exploring Photovoltaic Feasibility of Pentaaryl [60]Fullerene in Bulk Heterojunction Architecture

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  • Mikie Tsubasa
    Department of Applied Chemistry, Graduate School of Engineering, Osaka University
  • Saeki Akinori
    Department of Applied Chemistry, Graduate School of Engineering, Osaka University
  • Ikuma Naohiko
    Department of Applied Chemistry, Graduate School of Engineering, Osaka University
  • Kokubo Ken
    Department of Applied Chemistry, Graduate School of Engineering, Osaka University
  • Seki Shu
    Department of Applied Chemistry, Graduate School of Engineering, Osaka University

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The photochemical process of pentaaryl [60]fullerenes (PAC60) has been investigated by fluorescence and transient absorption spectroscopies, aiming at their use in bulk heterojunction organic photovoltaic (OPV). Fluorescence quenching was observed by adding C60 into PAC60, where the intensity was decreased in an exponential manner. The photo-generated radical cation of PAC60 was identified at 925 nm in the presence of electron acceptor. Motivated from the observed shallow molecular orbital levels of PAC60, we performed conceptual study of all-fullerene OPV, where PAC60 and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were presumably used as a p-type and n-type semiconductor, respectively. The power conversion efficiency was 0.007%, much smaller than 0.05% found for the conventional combination of P3HT (p-type) and PAC60 (n-type). The mechanism is discussed on the basis of photoconductive and spectroscopic results.

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