Journal
JOURNAL OF CRYSTAL GROWTH
Volume 357, Issue -, Pages 58-61Publisher
ELSEVIER
DOI: 10.1016/j.jcrysgro.2012.07.025
Keywords
Nanowires; Metalorganic chemical vapor deposition; Selective epitaxy; GaN
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Japan Society for the Promotion of Science (JSPS)
- JSPS
- Grants-in-Aid for Scientific Research [10J09067] Funding Source: KAKEN
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We report the selective-area growth (SAG) of Ga-polar thin GaN nanowires on patterned GaN/sapphire (0001) substrates using metalorganic chemical vapor deposition (MOCVD) with a continuous gas supply. It has been found that the anisotropy in the growth rates of the (0001) and the {1-100} facets of GaN reaches a maximum at low precursor flow rates for both Ga source and NH3. It has also been revealed that the SAG efficiency which is dependent on pattern fill-factor should be properly taken into account in order to grow thin GaN nanowires. Based on these findings, we demonstrate the growth of GaN nanowires with a diameter of 50 nm, which is the smallest reported so far by selective-area MOCVD. Optical properties of a single GaN nanowire have been investigated by low temperature micro-photoluminescence. It has been shown that an appropriate shell layer is effective to considerably improve the properties, suggesting the importance of controlling surface states. (C) 2012 Elsevier B.V. All rights reserved.
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