Effects of surface treatment on the velocity-field characteristics of AlGaN/GaN heterostructures

J. M. Barker, D. K. Ferry, Stephen Goodnick, D. D. Koleske, A. Allerman, R. J. Shul

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9 Scopus citations


AlGaN/GaN test structures were fabricated with an etched constriction. A nitrogen plasma treatment was used to remove the disordered layer, including natural oxides on the AlGaN surface, before the growth of the silicon nitride passivation film on several of the test structures. A pulsed voltage input, with a 200 ns pulse width, and a four-point measurement were used in a 50 Ω environment to determine the room temperature velocity-field characteristic of the structures. The samples performed similarly over low fields, giving a low-field mobility of 545 cm2 V-1 s-1. The surface treated sample performed slightly better at higher fields than the untreated sample. The highest velocity measured was 1.25 × 107 cm s-1 at a field of 26 kV cm-1.

Original languageEnglish (US)
Pages (from-to)S478-S480
JournalSemiconductor Science and Technology
Issue number4 SPEC. ISS.
StatePublished - Apr 1 2004

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


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