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Multiphonon Raman scattering in GaN nanowires
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View: Figures


Image of FIG. 1.
FIG. 1.

HRSEM images of nanowires grown on and substrates. Crystallographic structural studies using GIXRD show wurtzite GaN phase grown on both the substrates.

Image of FIG. 2.
FIG. 2.

UV Raman spectra showing higher order modes for GaN nanowires grown on and substrates. Insets show slow scan upto third order modes for samples grown on both the substrates. A clear fourth order mode is recorded for sample grown on . Fitted PL peak at corresponding to direct band gap is also shown in the inset.

Image of FIG. 3.
FIG. 3.

PL spectra of the epi-GaN and NWs with average diameter . epi-GaN shows a minor YL band along with a sharp direct band peak. A relatively broad direct band peak is shown for NWs with the absence of YL band. Inset shows multiphonon properties of these samples. Large backgrounds indicate strong PL signal in the samples.

Image of FIG. 4.
FIG. 4.

Size dependent plot for calculated (continuous line) Frank-Condon interaction energy as well as experimentally observed values (scattered points with error bar) for GaN nanostructures. Calculated value for bulk GaN and experimental data for epi-GaN is also marked in the figure. Inset shows HRSEM images of NWs with average diameter and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multiphonon Raman scattering in GaN nanowires