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Silver-Functionalized AlGaN/GaN Heterostructure Diode for Ethanol Sensing

Silver-Functionalized AlGaN/GaN Heterostructure Diode for Ethanol Sensing

Authors :
Jung, Sunwoo
Hyeon, Kwang
Ren, Fan
and, Pearton
Jang, Soohwan
Source :
Journal of the Electrochemical Society; January 2017, Vol. 164 Issue: 9 pB417-B420, 4p
Publication Year :
2017

Abstract

The use of Ag in the gate region of AlGaN/GaN heterostructure diodes is shown to provide stable, reversible changes in barrier height and thus current during exposure to ethanol at 250degC. The exposed ethanol molecules are adsorbed on the silver and oxidized, resulting in the increase of Schottky barrier height. The detection limit of ethanol at this temperature was 58 ppm, and the sensor response was linear over the range 58-58700 ppm. For the high end of this concentration range (5.87%), ethanol exposure at 250degC caused the Schottky barrier height to change from 0.604 eV to 0.656 eV, which produced a forward current relative change of 45.4% at 0.9V forward bias. The results are competitive with detection of ethanol by oxide thin films or nanostructures of SnO2, Fe2O3, CuO, and ZnO.

Details

Language :
English
ISSN :
00134651 and 19457111
Volume :
164
Issue :
9
Database :
Supplemental Index
Journal :
Journal of the Electrochemical Society
Publication Type :
Periodical
Accession number :
ejs52681895