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Structural characterization of GaN single crystal layers grown by vapor transport from a gallium oxide (Ga2O3) powder source

Published online by Cambridge University Press:  01 February 2011

Balaji Raghothamachar ,
Phanikumar Konkapaka ,
Huaqiang Wu ,
Michael Dudley  and
Michael Spencer
Balaji Raghothamachar
Affiliation:
braghoth@notes.cc.sunysb.edu, Stony Brook University, Materials Science & Engineering, Old Eng Rm 311, Stony Brook, NY, 11794-227, United States, 1 (631) 632 8501, 1 (631) 632 8052
Phanikumar Konkapaka
Affiliation:
pk59@cornell.edu, Cornell University, Department of Electrical and Computer Engineering, United States
Huaqiang Wu
Affiliation:
hw63@cornell.edu, Cornell University, Department of Electrical and Computer Engineering, United States
Michael Dudley
Affiliation:
mdudley@notes.cc.sunysb.edu, Stony Brook University, Deparment of Materials Science & Engineering, United States
Michael Spencer
Affiliation:
spencer@ece.cornell.edu, Cornell University, Department of Electrical and Computer Engineering, United States
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Abstract

The sublimation growth technique is highly attractive as a commercially viable GaN substrate technology on account of its simplicity and relatively high growth rates. Sublimation growth of GaN using GaN powder source, however, is hampered by formation of liquid Ga in the source. To overcome this limitation, an oxide transport process using a mixture of gallium oxide (Ga2O3) powder and graphite powder as precursors with nitrogen gas as carrier and ammonia as the source of nitrogen has been developed. GaN layers grown by this process were studied by optical microscopy, synchrotron white beam x-ray topography (SWBXT) and high resolution x-ray diffraction (HRXRD) to characterize their structural properties. Studies reveal that the GaN layers grown are single crystal but characterized by dislocation densities and impurities higher than those obtained using GaN powder source. Observed defect distribution is correlated with growth conditions to deduce optimal growth procedure.

Keywords

x-ray diffraction (XRD)crystal growthnitride
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 892 , 2005 , 0892-FF30-07
Copyright
Copyright © Materials Research Society 2006

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