Electrical characteristics of V/Ti/Au contacts to Ga-polar and N-polar n-gan prepared by different methods

Joon Woo Jeon, Seong Han Park, Se Yeon Jung, Jihyung Moon, June O. Song, Gon Namgoong, Tae Yeon Seong

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We have investigated the electrical properties of V (20 nm)/Ti (60 nm)/Au (20 nm) contacts to Ga- and N-polar n-GaN. Regardless of the crystal polarities, all the samples exhibit similar electrical characteristics. The as-deposited samples are ohmic. However, they become nonohmic when annealed at 300-500° C. The samples are ohmic again at 700°C. Based on the X-ray photoemission spectroscopy and Auger electron spectroscopy results, the ohmic and degradation behaviors are explained in terms of the formation of donorlike surface defects and Ga vacancies, which are generated by dry etching, the out-diffusion of Ga, and the formation of nitride phases.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Issue number4
Publication statusPublished - 2010 Feb 22


ASJC Scopus subject areas

  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Science(all)
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

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