Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3459968
Keywords
cathodoluminescence; deep levels; epitaxial growth; gallium compounds; high electron mobility transistors; III-V semiconductors; semiconductor heterojunctions
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Funding
- PRIN [2007]
- EDA [RTP 102.052]
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The kink effect in AlGaN/GaN high electron mobility transistor current-voltage characteristics is shown to be associated with the epitaxial growth and is unaffected by fabrication process or growth substrate in device wafers from two epitaxy sources and three foundries. We demonstrate that there is a direct correlation between the presence of the kink and the presence of a broad yellow cathodoluminescence band. On the basis of generally accepted models for yellow luminescence, we propose that the kink is due to the presence of deep levels in the GaN buffer layer which decrease the drain current when negatively charged. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3459968]
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