Ohmic contacts to n+ -GaN capped AlGaNAlNGaN high electron mobility transistors

Liang Wang, Fitih M. Mohammed, Benedict Ofuonye, Ilesanmi Adesida

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Investigations of TiAlMoAu Ohmic contact formation, premetallization plasma treatment effects, and interfacial reactions for n+ -GaN capped AlGaNAlNGaN heterostructures are presented. Ti thickness played an important role in determining contact performance. Transmission electron microscopy studies confirmed that thick Ti layer was necessary to fully consume the GaN cap and the top of AlGaN to enable a higher tunneling current flow. A direct correlation of plasma treatment conditions with I-V linearity, current level, and contact performance was established. The plasma-affected region is believed to extend over 20 nm into the AlGaN and GaN.

Original languageEnglish
Article number012113
JournalApplied Physics Letters
Volume91
Issue number1
DOIs
Publication statusPublished - Nov 19 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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