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Nonlinear Current-Voltage Characteristics of Homojunctions Made by Zinc Oxide Single Crystals

Published online by Cambridge University Press:  10 February 2011

Takeshi Harada ,
Yoshinobu Nakamura ,
Akira Kishimoto ,
Naobumi Motohira  and
Hiroaki Yanagida
Takeshi Harada
Affiliation:
Division of Applied Chemistry, School of Engineering, The University of Tokyo, Tokyo, JAPAN
Yoshinobu Nakamura
Affiliation:
Division of Applied Chemistry, School of Engineering, The University of Tokyo, Tokyo, JAPAN
Akira Kishimoto
Affiliation:
Division of Applied Chemistry, School of Engineering, The University of Tokyo, Tokyo, JAPAN
Naobumi Motohira
Affiliation:
Department of Energy Engineering, Faculty of Engineering, Yokohama National University, Kanagawa, JAPAN
Hiroaki Yanagida
Affiliation:
Japan Fine Ceramics Center, Aichi, JAPAN
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 343
Copyright
Copyright © Materials Research Society 1997

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References

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