Ohmic contacts to P-type epitaxial and implanted 4H-SiC

J. Crofton, J. R. Williams, A. V. Adedeji, J. D. Scofield, S. Dhar, L. C. Feldman, M. J. Bozack

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


Nickel ohmic contacts to p-type epitaxial and heavily implanted 4H-SiC are described. Room and elevated temperature results are presented. Elevated temperature measurements of specific contact resistance are compared to theoretical calculations. The calculations require the acceptor doping concentration and the contact's barrier height. Epitaxial material has a known acceptor value thereby allowing the barrier height to be deduced by requiring agreement between the calculated and measured values of the contact resistance. Calculations of the contact resistance for implanted material use the barrier height from the epitaxial results along with a variable activated acceptor doping concentration which is adjusted to give agreement with measured room temperature specific contact resistances. Specific contact resistances as low as 7×10-10 ohm-cm2 fabricated on the Si face have been obtained to epitaxial 4H p-type material whereas contacts to implanted material result in much larger contact resistance values of 4×10-5 ohm-cm2. These results, when compared to theoretical calculations, indicate that activated acceptor doping concentrations in heavily implanted material are on the order of 2% of the implant concentration.

Original languageEnglish
Title of host publicationSilicon Carbide and Related Materials - 2005, - Proceedings of the International Conference on Silicon Carbide and Related Materials -2005
PublisherTrans Tech Publications Ltd
Number of pages4
EditionPART 2
ISBN (Print)9780878494255
Publication statusPublished - Jan 1 2006
EventInternational Conference on Silicon Carbide and Related Materials 2005, (ICSCRM 2005) - Pittsburgh, PA, United States
Duration: Sep 18 2005Sep 23 2005

Publication series

NameMaterials Science Forum
NumberPART 2
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


OtherInternational Conference on Silicon Carbide and Related Materials 2005, (ICSCRM 2005)
CountryUnited States
CityPittsburgh, PA


  • Contact resistance
  • Implanted material
  • Ohmic contacts

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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