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Current saturation in indium oxide based ceramics

Published online by Cambridge University Press:  12 July 2007

A. Bondarchuk*
Affiliation:
Dniepropetrovsk National University, Dniepropetrovsk, 13 Naukovyi St. 49050, Ukraine
A. Glot
Affiliation:
Universidad Tecnológica de la Mixteca, Huajuapan de León, Oaxaca, C.P. 69000, Mexico
G. Behr
Affiliation:
Institut für Festkörper-u. Werkstofforschung IFW Dresden, Postfach 270016, 01171 Dresden, Germany
J. Werner
Affiliation:
Institut für Festkörper-u. Werkstofforschung IFW Dresden, Postfach 270016, 01171 Dresden, Germany
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Abstract

Current-voltage dependence for In2O3-SrO ceramics contains three regions: linear at low voltages, superlinear at intermediate voltages (current is increased stronger than voltage) and sublinear at higher voltages (current is increased weaker than voltage). The appearance of sublinear region after superlinear one cannot be explained by the existing theory. Based on the experimental data (electrical measurements, SEM and XPS) a modified grain-boundary model is suggested. In the model the additional adsorption of oxygen due to a capture of electrons at the grain-boundary states is assumed. Accordingly, the barrier height is increased and current is saturated. Calculated current-voltage dependences correspond experimentally observed ones.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 2007

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