Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1501558 | Scripta Materialia | 2009 | 4 Pages |
Abstract
We report evidence for non-destructive determination of dislocation type and Burgers vector direction in GaN using electron channeling contrast imaging (ECCI) inside a scanning electron microscope. Forescattered electron intensity fluctuations generated by threading dislocations exhibit characteristic spatial profiles indicative of dislocation type (screw, edge) and Burgers vector direction. Simulated channeling contrast features by two-beam dynamical diffraction calculations show qualitative agreement with recorded images. Forescatter ECCI sensitivity to atomic steps and low-angle grain boundaries in GaN allow for additional confirmation.
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Y.N. Picard, M.E. Twigg, J.D. Caldwell, C.R. Eddy Jr., M.A. Mastro, R.T. Holm,