Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Communications
Large Voltage Response of Novel Diode of Pt-TiOx-SiC Structure to Hydrogen Gas
Shinji NAKAGOMIHideyuki WATANABEYoshihiro KOKUBUN
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2003 Volume 71 Issue 6 Pages 394-397

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Abstract

A fabricated hydrogen sensor diode of Pt - thin TiOx layer - SiC structure was found to exhibit a large voltage response up to 3 volts. Diodes with and without the TiOx layer were compared in terms of current-voltage characteristics. The difference in voltage obtained in an H2 atmosphere and that obtained in an O2 atmosphere at a constant forward current was studied. A simple model consisting of a resistance and Schottky diode connected in series was assumed. The voltage change results from changes in both barrier height and series resistance. The change in series resistance is due to a property of TiOx under exposure to hydrogen.

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© 2003 The Electrochemical Society of Japan
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