Enhanced surface-excitonic emission in ZnO/Al(2)O(3) core-shell nanowires |
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| Authors: | Richters J-P Voss T Kim D S Scholz R Zacharias M |
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| Affiliation: | Institute of Semiconductor Optics, University of Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany. |
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| Abstract: | We report the influence of an Al(2)O(3) shell on the photoluminescence emission of ZnO nanowires. At room temperature, the spectrum of the core-shell nanowires shows a strong reduction of the relative intensity of the green defect emission with respect to the near-band-edge emission. At 5?K an increase of the relative intensity of the surface exciton band with respect to the donor-bound exciton emission is observed. Annealing the core-shell nanowires at 500?°C does not increase the green defect luminescence at 5?K. We propose a model explaining the spectral changes. |
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