Controllable Growth and Characterization of ZnO/MgO Quasi Core−Shell Quantum Dots
Y. J. Zeng (1822861)Z. Z. Ye (1822849)F. Liu (1664014)D. Y. Li (659476)Y. F. Lu (2399290)W. Jaeger (2399296)H. P. He (2338837)L. P. Zhu (2399293)J. Y. Huang (2369839)B. H. Zhao (2399287)
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.
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