High sensitivity (1 ppm) hydrogen detection using an unconventional Pd/n-InP Schottky device

Lei Feng, J. Mitra, P. Dawson, G. Hill

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3 Citations (Scopus)


Hydrogen is detected using a Pd/n-InP Schottky diode in which the elongated, very thin Pd electrode is of greater resistance than the underlying semiconductor substrate. Four-probe measurements of the device resistance, as a function of hydrogen concentration, are made by contacting only the Pd electrode, with a sensitivity of 1 ppm being achieved. On hydrogen exposure the device resistance drops from an initial high value, characteristic of the Pd electrode alone, to a lower value due to a hydrogen-induced lowering of the Schottky barrier that opens up the InP substrate as a parallel current carrying channel.

Original languageEnglish
Article number422201
Pages (from-to)-
Number of pages5
JournalJournal of Physics: Condensed Matter
Issue number42
Publication statusPublished - 26 Oct 2011

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