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Optical properties of strain-free AlN nanowires grown by molecular beam epitaxy on Si substrates
2014
Applied Physics Letters
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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 $100 meV was identified to be associated with the surface-optical phonon rather than the
doi:10.1063/1.4881558
fatcat:k6ehic5yxnhbleorlctasj3tqu