Microstructural properties and formation mechanisms of GaN nanorods grown on Al2O3 (0001) substrates

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X-ray diffraction patterns, scanning electron microscopy images, and transmission electron microscopy images showed that one-dimensional GaN nanorods with [0001]-oriented single-crystal line wurtzite structures were grown on Al2O3 (0001) substrates by hydride vapor-phase epitaxy without a catalyst. The tip morphology of the GaN nanorods became flat with increasing temperature difference between the gas mixing and the substrate zones. The gas mixing temperature significantly affected the formation of the nanorods, and the substrate temperature influenced the morphology and the strain of the GaN nanorods near the GaN/Al2O3 heterointerface. The strain and the stress existing in the GaN layer near the heterointerface were decreased with increasing growth rate. The formation mechanisms of the GaN nanorods grown on the Al2O3 (0001) substrates are described on the basis of the experimental results.
Publisher
MATERIALS RESEARCH SOC
Issue Date
2009-08
Language
English
Article Type
Article
Keywords

VAPOR-PHASE EPITAXY; LIGHT-EMITTING-DIODES; SEMICONDUCTOR NANOWIRES; NANOTUBES

Citation

JOURNAL OF MATERIALS RESEARCH, v.24, pp.2476 - 2482

ISSN
0884-2914
DOI
10.1557/JMR.2009.0298
URI
http://hdl.handle.net/10203/94582
Appears in Collection
MS-Journal Papers(저널논문)
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