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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
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 | ||||||||
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| 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: |
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| 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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