Robust detection of hydrogen using differential AlGaN∕GaN high electron mobility transistor sensing diodes

The use of AlGaN∕GaN high electron mobility transistor (HEMT) differential sensing diodes is shown to provide robust detection of 1% H2 in air at 25°C. The active device in the differential pair is coated with 10nm of Pt to enhance catalytic dissociation of molecular hydrogen, while the reference di...

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Bibliographic Details
Published in:Applied physics letters 2006-12, Vol.89 (24)
Main Authors: Wang, Hung-Ta, Anderson, T. J., Ren, F., Li, Changzhi, Low, Zhen-Ning, Lin, Jenshan, Gila, B. P., Pearton, S. J., Osinsky, A., Dabiran, Amir
Format: Article
Language:English
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Summary:The use of AlGaN∕GaN high electron mobility transistor (HEMT) differential sensing diodes is shown to provide robust detection of 1% H2 in air at 25°C. The active device in the differential pair is coated with 10nm of Pt to enhance catalytic dissociation of molecular hydrogen, while the reference diode is coated with Ti∕Au. The active diode in the pair shows an increase in forward current of several milliamperes at a bias voltage of 2.5V when exposed to 1% H2 in air. The HEMT diodes show a response approximately twice that of GaN Schottky diodes, due to the presence of piezoelectric and spontaneous polarization in the heterostructure. The use of the differential pair removes false alarms due to ambient temperature variations.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2408635