title: 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.
abstract: We report the influence of the native amorphous SiO(2) shell on the cathodoluminescence emission of 3C-SiC/SiO(2) 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 SiO(2) and SiC bands in a type I quantum well. An accurate correlation between the optical emission and structural and SiO(2)-SiC interface properties is also reported.
authors.affiliation: IMEM-CNR Institute, Parma, Italy.
authors.forename: Filippo
authors.initials: F
authors.lastname: Fabbri
authors.forename: Francesca
authors.initials: F
authors.lastname: Rossi
authors.forename: Giovanni
authors.initials: G
authors.lastname: Attolini
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Salviati
authors.forename: Salvatore
authors.initials: S
authors.lastname: Iannotta
authors.forename: Lucrezia
authors.initials: L
authors.lastname: Aversa
authors.forename: Roberto
authors.initials: R
authors.lastname: Verucchi
authors.forename: Marco
authors.initials: M
authors.lastname: Nardi
authors.forename: Naoki
authors.initials: N
authors.lastname: Fukata
authors.forename: Benjamin
authors.initials: B
authors.lastname: Dierre
authors.forename: Takashi
authors.initials: T
authors.lastname: Sekiguchi