Electronic structure and surface morphology of [6,6]-phenyl-C 71-butyric acid methyl ester films

Ayumi Nogimura, Kouki Akaike, Rie Nakanishi, Ritsuko Eguchi, Kaname Kanai

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)


    We investigate the electronic structure of [6,6]-phenyl-C 71-butyric acid methyl ester (PC70BM) films by ultraviolet photoelectron and inverse photoemission spectroscopy. We discuss the electronic structure of PC70BM in comparison with C70 and [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM). The molecular orbitals around the energy gap of PC70BM are broadly distributed due to the low symmetry of the molecular structure. Consequently, the energy gap of PC70BM is smaller than that of C70 and PC60BM. The film deposition method affects the polarization energy between the PC70BM molecules, and thus affects the electronic structure of the films.

    Original languageEnglish
    Pages (from-to)3222-3227
    Number of pages6
    JournalOrganic Electronics
    Issue number12
    Publication statusPublished - 2013

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Biomaterials
    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry
    • Electrical and Electronic Engineering


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