title: Core-shell multi-quantum wells in ZnO/ZnMgO nanowires with high optical efficiency at room temperature.
abstract: Nanowire-based light-emitting devices require multi-quantum well heterostructures with high room temperature optical efficiencies. We demonstrate that such efficiencies can be attained through the use of ZnO/Zn((1-x))Mg(x)O core-shell quantum well heterostructures grown by metal organic vapor phase epitaxy. Varying the barrier Mg concentration from x = 0.15 to 0.3 leads to the formation of misfit induced dislocations in the multi-quantum wells. Correlatively, temperature dependent photoluminescence reveals that the radial well luminescence intensity decreases much less rapidly with increasing temperature for the lower Mg concentration. Indeed, about 54% of the 10 K intensity is retained at room temperature with x = 0.15, against 1% with x = 0.30. These results open the way to the realization of high optical efficiency nanowire-based light-emitting diodes.
authors.affiliation: CEA, LETI, Minatec Campus, Grenoble, France.
authors.forename: R
authors.initials: R
authors.lastname: Thierry
authors.forename: G
authors.initials: G
authors.lastname: Perillat-Merceroz
authors.forename: P H
authors.initials: PH
authors.lastname: Jouneau
authors.forename: P
authors.initials: P
authors.lastname: Ferret
authors.forename: G
authors.initials: G
authors.lastname: Feuillet
mesh_terms: D046911:Macromolecular Substances / Q000737:chemistry; D008277:Magnesium Oxide / Q000737:chemistry*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D045663:Quantum Dots; D013499:Surface Properties; D013696:Temperature; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D046911:Macromolecular Substances; D008277:Magnesium Oxide; D015034:Zinc Oxide