title: High sensitivity (1 ppm) hydrogen detection using an unconventional Pd/n-InP Schottky device.
abstract: 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.
authors.affiliation: Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK.
authors.forename: Lei
authors.initials: L
authors.lastname: Feng
authors.forename: J
authors.initials: J
authors.lastname: Mitra
authors.forename: P
authors.initials: P
authors.lastname: Dawson
authors.forename: G
authors.initials: G
authors.lastname: Hill