Istituto dei materiali per l'elettronica ed il magnetismo     
Fabbri F., Rossi F., Attolini G., Salviati G., Iannotta S., Aversa L., Verucchi R., Nardi M., Fukata N., Dierre B., Sekiguchi T. Enhancement of the core near-band-edge emission induced by an amorphous shell in coaxial one-dimensional nanostructure: the case of SiC/SiO2 core/shell self-organized nanowires. In: Nanotechnology, vol. 21 article n. 345702. IOP Publishing Ltd, 2010.
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.
URL: http://stacks.iop.org/Nano/21/345702
DOI: 10.1088/0957-4484/21/34/345702
Subject Cathodoluminescence (CL) technique
Silicon Carbide nanowires

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