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Silver antimony Ohmic contacts to moderately doped n-type germanium

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Dumas, D. C. S., Gallacher, Kevin, Millar, R., MacLaren, I., Myronov, Maksym, Leadley, D. R. (David R.) and Paul, Douglas J. (Professor of Semiconductor Devices)‏ (2014) Silver antimony Ohmic contacts to moderately doped n-type germanium. Applied Physics Letters, Volume 104 (Number 16). Article number 162101. doi:10.1063/1.4873127

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Official URL: http://dx.doi.org/10.1063/1.4873127

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Abstract

A self doping contact consisting of a silver/antimony alloy that produces an Ohmic contact to moderately doped n-type germanium (doped to a factor of four above the metal-insulator transition) has been investigated. An evaporation of a mixed alloy of Ag/Sb (99%/1%) onto n-Ge ( ND=1×1018 cm−3) annealed at 400 °C produces an Ohmic contact with a measured specific contact resistivity of (1.1±0.2)×10−5 Ω-cm2. It is proposed that the Ohmic behaviour arises from an increased doping concentration at the Ge surface due to the preferential evaporation of Sb confirmed by transmission electron microscope analysis. It is suggested that the doping concentration has increased to a level where field emission will be the dominate conduction mechanism. This was deduced from the low temperature electrical characterisation of the contact, which exhibits Ohmic behaviour down to a temperature of 6.5 K.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Antimony alloys, Silver alloys, Germanium, Ohmic contacts
Journal or Publication Title: Applied Physics Letters
Publisher: American Institute of Physics
ISSN: 0003-6951
Official Date: 21 April 2014
Dates:
DateEvent
21 April 2014Published
13 April 2014Accepted
14 February 2014Submitted
Volume: Volume 104
Number: Number 16
Article Number: Article number 162101
DOI: 10.1063/1.4873127
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: Engineering and Physical Sciences Research Council (EPSRC)

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