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Threading dislocations with edge components in GaN epilayers grown on Al2O3 substrates

Published online by Cambridge University Press:  31 January 2011

Junyong Kang  and
Tomoya Ogawa
Junyong Kang*
Affiliation:
Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China
Tomoya Ogawa
Affiliation:
Department of Physics, Gakushuin University, Mejiro, Tokyo 171–8588, Japan
*
a)Address all correspondence to this author.cheng@imr.ac.cn
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Abstract

Two types of threading dislocations with edge components were investigated by a high-resolution transmission electron microscope in undoped GaN epilayers grown on Al2O3 substrates. One is a fully filled core with regular contraction and stretch of bright dots, and the other is incompletely filled with one bright dot less and irregular contraction and stretch of bright dots. The bright dots were distorted and degenerated into bright line segments at cores in areas with smaller local dislocation intervals. The calculated results suggested that the distorted bright regions are attributable to the glide and/or climb caused by nearby dislocation interactions.

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Articles
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Journal of Materials Research , Volume 16 , Issue 9 , September 2001 , pp. 2550 - 2555
Copyright
Copyright © Materials Research Society 2001

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