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나노 구조 물리 연구단
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Migration mechanism of a GaN bicrystalline grain boundary as a model system

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Title
Migration mechanism of a GaN bicrystalline grain boundary as a model system
Author(s)
Lee, SB; Yoo, SJ; Young-Min Kim; Kim, JG; Han, HN
Publication Date
2016-05
Journal
SCIENTIFIC REPORTS, v.6, no., pp.26493 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Using in situ high-resolution transmission electron microscopy, we have explored migration mechanism of a grain boundary in a GaN bicrystal as a model system. During annealing at 500 degrees C, the grain-boundary region underwent a decrease in thickness, which occurred by decomposition or sublimation of GaN during annealing at 500 degrees C coupled with electron-beam sputtering. The decrease in thickness corresponds to an increase in the driving force for migration, because the migration of the grain boundary was driven by the surface energy difference. As the driving force increased with annealing time, the grain-boundary morphology turned from atomically smooth to rough, which is characterized by kinetic roughening. The observations indicate that a grain boundary exhibits a nonlinear relationship between driving force for migration and migration velocity, in discord with the general presumption that a grain boundary follows a linear relationship.
URI
http://pr.ibs.re.kr/handle/8788114/2532
DOI
10.1038/srep26493
ISSN
2045-2322
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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