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Methods and devices related to electrodes for p-type group III nitride compound semiconductors

  • US 6,121,127 A
  • Filed: 11/16/1999
  • Issued: 09/19/2000
  • Est. Priority Date: 06/14/1996
  • Status: Expired due to Term
First Claim
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1. A method of forming an electrode of a Group III nitride compound semiconductor having p-type conduction comprising the steps of:

  • selecting an element of a first metal electrode layer having an ionization potential that is lower than that of an element of a second metal electrode layer;

    selecting said element of said second metal electrode layer so that it has better ohmic contact to said Group III nitride compound semiconductor than said element of said first metal electrode layer;

    forming said first metal electrode layer on said Group III nitride compound semiconductor;

    forming said second metal electrode layer on said first metal electrode layer; and

    carrying out heat treatment so that said element of said second metal electrode layer is distributed more deeply into said Group III nitride compound semiconductor than is said element of said first metal electrode layer.

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