Journal
NANOTECHNOLOGY
Volume 21, Issue 34, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/21/34/345702
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We report the influence of the native amorphous SiO2 shell on the cathodoluminescence emission of 3C-SiC/SiO2 core/shell nanowires. A shell-induced enhancement of the SiC near-band-edge emission is observed and studied as a function of the silicon dioxide thickness. Since the diameter of the investigated SiC cores rules out any direct bandgap optical transitions due to confinement effects, this enhancement is ascribed to a carrier diffusion from the shell to the core, promoted by the alignment of the SiO2 and SiC bands in a type I quantum well. An accurate correlation between the optical emission and structural and SiO2-SiC interface properties is also reported.
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