Journal
CRYSTAL GROWTH & DESIGN
Volume 9, Issue 1, Pages 263-266Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg800422g
Keywords
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Funding
- National Basic Research Program of China [2006CB604906]
- National Natural Science Foundation of China [50532060, 50572095]
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ZnO/MgO quasi core-shell quantum dots (QDs) were grown by a metal-organic chemical vapor deposition method on silicon substrates. The core-shell structure was well-characterized by a combination of cross-sectional transmission electron microscopy and angle-resolved X-ray photoelectron spectroscopy (XPS). Valence band XPS measurements were performed to investigate the effects of MgO shell layer on the energy band of ZnO/MgO QDs. Photoluminescence (PL) emission from the QDs showed remarkable enhancement after the growth of the MgO layer. In addition, exciton binding energy of 118 +/- 5 meV in the ZnO/MgO QDs was obtained from temperature-dependent PL.
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