Effect of Argon Ion Irradiation on Ohmic Contact Formation on n-type Gallium Nitride

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Abstract

This paper describes electrical properties at the interface between n-type GaN and Ti contact layers formed by RF magnetron sputter deposition under various time of Ar<sup>+</sup> irradiation. The conductance increases proportionately to the extension of the Ar<sup>+</sup> irradiation time, indicating that Ar<sup>+</sup> irradiation enhances the formation of nitrogen vacancies and consequently Schottky barrier width is narrowed. On the other hand, extensive Ar<sup>+</sup> irradiation for 3600 s and longer does not show further increase of conductance. Extensive selective sputtering of nitrogen atoms out of GaN has induced the phase transformation from GaN to Ga at the surface of GaN. The Ga phase enhances the formation of Ga–Ti compounds during the deposition of Ti, and it increases the height and width of the Schottky barrier.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54(6), 895-898, 2013-06-01

    The Japan Institute of Metals and Materials

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Codes

  • NII Article ID (NAID)
    10031176404
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • Article Type
    REV
  • ISSN
    13459678
  • NDL Article ID
    024524618
  • NDL Call No.
    Z53-J286
  • Data Source
    CJP  NDL  J-STAGE 
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