Dispersive charge transport due to strong charge-dipole interactions of cyano-group in the cyano-carbazole based molecular glass

Dong Keun Oh, Sung Mok Hong, Cheol Eui Lee, B. S. Kim, J. I. Jin

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Using the time of flight (ToF) method, we investigated the bipolar charge transport for two glass-forming molecules containing carbazole and cyano-carbazole moiety. The enhanced electron mobility was observed in the cyano-carbazole compound. From the numerical method based the Laplace formalism, the distribution of hole trapping energy was obtained for the carbazole compound. This result was compared with the exponential distribution extracted from dispersion parameter for the cyano-carbazole material. Considering charge-dipole interactions as a reason for the disordered trapping mechanism, we discussed dispersive charge transport induced by a strong dipolar (i.e. cyano) group by comparing the distributions of hole trapping sites for two compounds.

    Original languageEnglish
    Pages (from-to)585-590
    Number of pages6
    JournalSolid State Communications
    Volume136
    Issue number11-12
    DOIs
    Publication statusPublished - 2005 Dec

    Bibliographical note

    Funding Information:
    This work is supported by the Material Science Collaboration Research fund of KBSI, Research Foundation Grant for basic science support (KRF-2002-015-CP0125) and the Korea Science and Engineering Foundation through CRM of Korea University.

    Keywords

    • A. Disordered system
    • A. Organic glasses
    • D. Electronic transport
    • D. Recombination and trapping

    ASJC Scopus subject areas

    • General Chemistry
    • Condensed Matter Physics
    • Materials Chemistry

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