TITLE

Ga vacancies and grain boundaries in GaN

AUTHOR(S)
Oila, J.; Saarinen, K.; Wickenden, A. E.; Koleske, D. D.; Henry, R. L.; Twigg, M. E.
PUB. DATE
February 2003
SOURCE
Applied Physics Letters;2/17/2003, Vol. 82 Issue 7, p1021
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have applied a low-energy positron beam to study epitaxial Si-doped GaN layers, where the grain size varies from 0.2 to 2-5 µm. Negatively charged Ga vacancies are found in n-type samples. Their concentration is independent of the grain size, suggesting that Ga vacancies exist in the grain interior. Positrons are observed to get trapped also at other negatively charged centers. The positron trapping rate at these defects correlates with the grain-boundary density. We attribute the observed shallow positron traps, which do not contain open volume, to negatively charged edge-type dislocations which define the grain boundaries.
ACCESSION #
9070306

 

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