TITLE

Effect of the polar surface on GaN nanostructure morphology and growth orientation

AUTHOR(S)
Nam, C. Y.; Tham, D.; Fischer, J. E.
PUB. DATE
December 2004
SOURCE
Applied Physics Letters;12/6/2004, Vol. 85 Issue 23, p5676
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Wurtzite gallium nitride nanostructures were grown by thermal reaction of gallium oxide and ammonia. The resulting morphology varied depending on ammonia flow rate. At 75 sccm only nanowires were obtained, while polyhedral crystals and nanobelts were observed at 175 sccm. Scanning electron microscopy and transmission electron microscopy revealed both thin smooth and thick corrugated nanowires. The growth orientations of most of the smooth ones, as well as the nanobelts, were perpendicular to the c axis (<0001>), while the corrugated nanowires and the large polyhedra grew parallel to <0001>. We propose a model to explain these variations of morphology and growth orientation in terms of the Ga/N ratio and the different characteristic length of {0001} polar surface in the different nanostructures.
ACCESSION #
15305378

 

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