Nonlinear current-voltage characteristics of homojunctions made by zinc oxide single crystals

Takeshi Harada, Yoshinobu Nakamura, Akira Kishimoto, Naobumi Motohira, Hiroaki Yanagida

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


Zinc oxide (ZnO) single crystals are grown by the traditional chemical vapor reaction method and ZnO crystal pairs with a single boundary are successfully obtained. The obtained specimens with one ZnO-ZnO boundary (ZnO homojunction) show nonlinear current-voltage (I-V) characteristics without the addition of Bi2O3, CoO, MnO2, and/or rare earth metal oxides. A specimen with higher breakdown voltage shows superior nonlinearity with negative resistivity in its I-V characteristics. Electrical characterization of the ZnO homojunction is conducted and extremely slow response with the current (or voltage) stress is confirmed. The phenomenon had never been observed in commercial ZnO varistors. The surface temperature of the ZnO homojunction is enhanced by larger applied current. The effect of the Joule heat on the nonlinearity in the I-V curves of the ZnO homojunction is discussed.

Original languageEnglish
Pages (from-to)343-347
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - Jan 1 1997
Externally publishedYes
EventProceedings of the 1996 MRS Fall Meeting - Boston, MA, USA
Duration: Dec 2 1996Dec 6 1996

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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