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Low power hydrogen gas sensors using electrodeposited PdNi-Si Schottky diodes

Usgaocar, A.R., de Groot, C.H., Boulart, Cédric, Castillo, Alain and Chavagnac, Valérie (2012) Low power hydrogen gas sensors using electrodeposited PdNi-Si Schottky diodes [in special issue: Eurosensors XXIV, 2010] Sensors and Actuators B: Chemical, 170, pp. 176-181. (doi:10.1016/j.snb.2011.06.022).

Record type: Article

Abstract

The use of electrodeposited PdNi-Si Schottky barriers as low power Hydrogen sensors is investigated. The Palladium content of the film causes the Hydrogen molecules to dissociate and be absorbed by the film, changing the metal work function and Schottky barrier current. In this work we show that electrodeposited Pd(Ni)-Si Schottky barriers exhibit very low reverse bias currents compared to evaporated Schottky diodes. The Schottky diodes were fabricated on 0.5-1.5 ohmcm 100 n-type Si by electrodeposition of PdNi followed by evaporation of Aluminium contact pads. Electrical measurements at different Hydrogen pressures were performed on back to back Schottky diodes in a vacuum chamber using pure Nitrogen and a 5% Hydrogen-Nitrogen mixture. Very low currents of 1nA were measured in the absence of Hydrogen. Large increases in the currents, upto a factor of 100, were observed upon exposure to different Hydrogen partial pressures. A back to back configuration forms a device that draws extremely low power when idle. The low idle current, simplicity of the fabrication process and ability to easily integrate with conventional electronics proves the suitability of electrodeposited PdNi-Si Schottky barriers as low power Hydrogen sensors.

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e-pub ahead of print date: 17 May 2012
Published date: 31 July 2012
Keywords: schottky barriers, hydrogen sensors, electrodeposition, PdNi alloys
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 272569
URI: http://eprints.soton.ac.uk/id/eprint/272569
ISSN: 0925-4005
PURE UUID: 287cf1e6-d618-43e9-93a1-9186982d2ba6
ORCID for C.H. de Groot: ORCID iD orcid.org/0000-0002-3850-7101

Catalogue record

Date deposited: 13 Jul 2011 09:46
Last modified: 18 Jul 2017 06:23

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Contributors

Author: A.R. Usgaocar
Author: C.H. de Groot ORCID iD
Author: Cédric Boulart
Author: Alain Castillo
Author: Valérie Chavagnac

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