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Crystal Growth & Design

Publication date: 2009-01
Pages: 263 - 266
ISSN: 1528-7483, 1528-7505
DOI: 10.1021/cg800422g
Publisher: American Chemical Society

Author:

Zeng, Yujia
Ye, Z ; Liu, F ; Jaeger, W ; Zhu, L ; Huang, J ; Zhao, B

Keywords:

core/shell nanocrystals, size series, zno, cdse, nanoparticles, photoluminescence, energy, layer, wells, Science & Technology, Physical Sciences, Technology, Chemistry, Multidisciplinary, Crystallography, Materials Science, Multidisciplinary, Chemistry, Materials Science, CORE/SHELL NANOCRYSTALS, SIZE SERIES, ZNO, CDSE, NANOPARTICLES, PHOTOLUMINESCENCE, ENERGY, LAYER, WELLS, 0306 Physical Chemistry (incl. Structural), 0912 Materials Engineering, 0302 Inorganic Chemistry, Inorganic & Nuclear Chemistry

Abstract:

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.