Current-voltage characteristics of cobalt-doped inversion boundaries in zinc oxide bicrystals

Fumiyasu Oba, Yukio Sato, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)


    Undoped and cobalt-doped basal inversion boundaries were fabricated in ZnO bicrystals to investigate their current-voltage characteristics. High-resolution transmission electron microscopy observations and energy-dispersive X-ray spectroscopy analyses for a cobalt-doped bicrystal revealed that the boundary was highly coherent and free from intergranular phases and precipitates, but a certain amount of cobalt was present near the boundary. The cobalt-doped bicrystals exhibited nonlinear characteristics that depend on cooling rates from annealing temperature, in contrast to linear characteristics of the undoped bicrystals. It is suggested that the presence of cobalt impurities enhances the formation of acceptor-like native defects near the boundaries to generate electrostatic potential barriers.

    Original languageEnglish
    Pages (from-to)1616-1618
    Number of pages3
    JournalJournal of the American Ceramic Society
    Issue number9
    Publication statusPublished - 2003 Sept

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry


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