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Growth optimization for high quality GaN films grown by metal-organic chemical vapor deposition

Published online by Cambridge University Press:  01 February 2011

Jung Hun Jang ,
A M Herrero ,
Seungyoung Son ,
B Gila ,
C Abernathy  and
V Craciun
Jung Hun Jang
Affiliation:
[email protected], University of Florida, Materials Science and Engineering, Materials Science and Engineering, 100 Rhines Hall, P.O.Box 116400, Gainesville, FL, 32611-6400, United States
A M Herrero
Affiliation:
[email protected], University of Florida, Materials Science and Engineering, Gainesville, FL, 32611, United States
Seungyoung Son
Affiliation:
[email protected], University of Florida, Materials Science and Engineering, Gainesville, FL, 32611, United States
B Gila
Affiliation:
[email protected], University of Florida, Materials Science and Engineering, Gainesville, FL, 32611, United States
C Abernathy
Affiliation:
[email protected], University of Florida, Materials Science and Engineering, Gainesville, FL, 32611, United States
V Craciun
Affiliation:
[email protected], University of Florida, Materials Science and Engineering, Gainesville, FL, 32611, United States
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Abstract

GaN layers were grown on c-plane sapphire substrates by using a conventional two step growth method via metal organic chemical vapor deposition (MOCVD). The effect of different growth conditions used in the deposition of the low temperature nucleation layer and high temperature islands on the crystalline quality of the GaN layers was investigated by high resolution X-ray diffraction (HRXRD) and transmission electron microscopy (TEM). The polar (tilt) and azimuthal (twist) spread were estimated from the full width at half maximum (FWHM) values of the omega rocking curves (¥ø-RCs) recorded from the planes parallel and perpendicular to the sample surface. It was found from the XRD and TEM study that the edge and mixed type threading dislocations are dominant defects so that the relevant figure of merit (FOM) for the crystalline quality should be considered only by the FWHM value of ¥ø-RC of the surface perpendicular plane. The result showed that the mixed- and edge-types dislocations were strongly associated with the growth conditions used in the deposition of the nucleation layer and high temperature islands.

Keywords

defectsmetalorganic depositionx-ray diffraction (XRD)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1068: Symposium C – Advances in GaN, GaAs, SiC and Related Alloys on Silicon Substrates , 2008 , 1068-C03-08
Copyright
Copyright © Materials Research Society 2008

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