Segregation of In to dislocations in InGaN.
Change log
Authors
Abstract
Dislocations are one-dimensional topological defects that occur frequently in functional thin film materials and that are known to degrade the performance of InxGa1-xN-based optoelectronic devices. Here, we show that large local deviations in alloy composition and atomic structure are expected to occur in and around dislocation cores in InxGa(1-x)N alloy thin films. We present energy-dispersive X-ray spectroscopy data supporting this result. The methods presented here are also widely applicable for predicting composition fluctuations associated with strain fields in other inorganic functional material thin films.
Description
Keywords
Dislocations, III-nitrides, Monte Carlo, STEM-EDX, alloy segregation, atomistic modeling, Gallium, Indium, Microscopy, Electron, Scanning Transmission, Nitrogen, Spectrometry, X-Ray Emission
Journal Title
Nano Lett
Conference Name
Journal ISSN
1530-6984
1530-6992
1530-6992
Volume Title
15
Publisher
American Chemical Society (ACS)
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. SKR is funded through the Cambridge-India Partnership Fund and Indian Institute
of Technology Bombay via a scholarship. MAM acknowledges support from the Royal Society
through a University Research Fellowship. Additional support was provided by the EPSRC
through the UK National Facility for Aberration-Corrected STEM (SuperSTEM). The Titan 80-
200kV ChemiSTEMTM 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 Treat Reduction Agency (DTRA) USA (grant number
HDTRA1-12-1-0013).