Dislocation core structures in (0001) InGaN
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Authors
Abstract
jats:pThreading dislocation core structures in c-plane GaN and InxGa1−xN (0.057 ≤ x ≤ 0.20) films were investigated by aberration-corrected scanning transmission electron microscopy. a-type dislocations are unaffected by alloying with indium and have a 5/7-atom ring core structure in both GaN and InxGa1−xN. In contrast, the dissociation lengths of (a + c)-type dislocations are reduced, and new 7/4/9-atom ring and 7/4/8/5-atom ring core structures were observed for the dissociated (a + c)-type dislocations in InxGa1−xN, which is associated with the segregation of indium near (a + c)-type and c-type dislocation cores in InxGa1−xN, consistent with predictions from atomistic Monte Carlo simulations.</jats:p>
Description
Keywords
dislocations, InGaN, core structure, aberration-corrected STEM-HAADF, alloy segregation, STEM-EDXS
Journal Title
Journal of Applied Physics
Conference Name
Journal ISSN
0021-8979
1089-7550
1089-7550
Volume Title
Publisher
AIP Publishing
Publisher DOI
Sponsorship
Engineering and Physical Sciences Research Council (EP/H019324/1)
Engineering and Physical Sciences Research Council (EP/I012591/1)
Engineering and Physical Sciences Research Council (EP/M010589/1)
Engineering and Physical Sciences Research Council (EP/I012591/1)
Engineering and Physical Sciences Research Council (EP/M010589/1)
This work was funded in part by the Cambridge Commonwealth Trust, St. John’s College and the EPSRC (grant number EP/I012591/1). MAM acknowledges support from the Royal Society through a University Research Fellowship. Additional support was provided by the EPSRC (Supplementary data for EPSRC [49] is available) through the UK National Facility for Aberration-Corrected STEM (SuperSTEM). The Titan 80-200kV ChemiSTEM™ was funded through HM Government (UK) and is associated with the capabilities of the University of Manchester Nuclear Manufacturing (NUMAN) capabilities. SJH acknowledges funding from the Defence Threat Reduction Agency (DTRA) USA (grant number HDTRA1-12-1-0013). The authors also acknowledge C. M. McGilvery and A. Kovacs for helpful discussions.