期刊
APPLIED PHYSICS LETTERS
卷 104, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4881558
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资金
- Natural Sciences and Engineering Research Council of Canada
- Fonds de recherche sur la nature et les technologies
- Department of Energy, USA [FG02-09ER46552]
- ATT Foundation
The optical properties of catalyst-free AlN nanowires grown on Si substrates by molecular beam epitaxy were investigated. Such nanowires are nearly free of strain, with strong free exciton emission measured at room temperature. The photoluminescence intensity is significantly enhanced, compared to previously reported AlN epilayer. Moreover, the presence of phonon replicas with an energy separation of similar to 100 meV was identified to be associated with the surface-optical phonon rather than the commonly reported longitudinal-optical phonon, which is further supported by the micro-Raman scattering experiments. (C) 2014 AIP Publishing LLC.
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