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Influence of donor density in ZnO on ZnO–PrCoOx thin-film junctions: Role of O2 and Al dopant in varistors

Published online by Cambridge University Press:  03 March 2011

Yoshihiko Yano ,
Yukihiko Shirakawa  and
Hisao Morooka
Yoshihiko Yano
Affiliation:
R&D Center, TDK Corporation, 2-15-7 Higashioowada, Ichikawa-shi, Chiba 272, Japan
Yukihiko Shirakawa
Affiliation:
R&D Center, TDK Corporation, 2-15-7 Higashioowada, Ichikawa-shi, Chiba 272, Japan
Hisao Morooka
Affiliation:
R&D Center, TDK Corporation, 2-15-7 Higashioowada, Ichikawa-shi, Chiba 272, Japan
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Abstract

ZnO/PrCoOx and ZnO/PrCoOx/ZnO junctions have been fabricated by sputtering as a model of a single grain boundary in a ceramic ZnO varistor. The relations between barrier parameters and varistor characteristics were investigated using voltage-current (V-I) capacitance-voltage (C-V), and deep-level transient spectroscopy (DLTS) measurements. The varistor voltage of the junctions increases as the donor density (ND) of the ZnO film decreases. The interface states vary according to the method of ZnO sputtering. A clear correlation has been established between the α value and the interface states. The highest α value is obtained when ND is ≃ 1018 cm−3, the interface level is 0.70 eV, and the breakdown voltage is 3–4 V. Oxygen is effective on control of ND in ZnO and the interface states. Al added as a dopant is also effective in terms of its ability to increase ND in ZnO. However, Al doping was found to degrade the interface states and increase the leakage current.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 3 , March 1994 , pp. 669 - 673
Copyright
Copyright © Materials Research Society 1994

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