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 - Sept 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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