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Current saturation in indium oxide based ceramics

Published online by Cambridge University Press:  12 July 2007

A. Bondarchuk ,
A. Glot ,
G. Behr  and
J. Werner
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
*
[email protected]
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Abstract

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

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 39 , Issue 3 , September 2007 , pp. 211 - 217
Copyright
© EDP Sciences, 2007

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