Photoinduced charge separation in poly(1,4-phenylenevinylene) derivatives studied by electron paramagnetic resonance

E. A. Thomsen, D. J. Keeble, B. Lochab, P. L. Burn, H. El-Mkami, I. D. W. Samuel

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    Abstract

    We report a study of photoincluced charge separation in poly(1,4-phenylenevinylene) (PPV) derivatives with enhanced exciton dissociation using light-induced electron paramagnetic resonance (EPR). Four polymers were studied; all contained alkoxy and fluorenyl side chain units, and two of them also contained a nitro group on the 7-positon of the fluorenyl moieties. Pulsed EPR detected a light induced polaron for all the polymers with the intensity significantly higher for those with nitro groups. A second center was observed for these materials and spectra could be fitted assuming a radical anion was localized on the nitro groups. The fraction of radical anion and polaron centers was comparable, consistent with intramolecular exciton dissociation for the PPV derivatives containing the nitro groups. (C) 2008 Elsevier B.V. All rights reserved.

    Original languageEnglish
    Pages (from-to)809-815
    Number of pages7
    JournalOrganic Electronics
    Volume9
    Issue number5
    DOIs
    Publication statusPublished - Oct 2008

    Keywords

    • PPVs
    • exciton dissociation
    • electron paramagnetic resonance
    • POLYMER SOLAR-CELLS
    • POLY(PARA-PHENYLENE VINYLENE)
    • PHOTOVOLTAIC CELLS
    • POLARONS
    • SPECTRA
    • POLYFLUORENE
    • DEVICES

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