Cathodoluminescence characterization of ZnO : Te microstructures obtained with ZnTe and TeO_2 doping precursors
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2008
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Academic Press Ltd- Elsevier Science Ltd
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Abstract
ZnTe- and TeO_2-doped ZnO nanostructures and microstructures were obtained by a vapour-solid process by sintering compacted ZnO powder mixed with each precursor. Cathodoluminescence (CL) measurements show that if TeO_2 is used, then the defect band, due mainly to O vacancies (V-O), tends to reduce and even disapear, which indicates that Te reacts with ZnO and passivates the O vacancies better than if ZnTe is used as a precursor. With both precursors, a CL peak at about 3.08-3.17 eV, which overlaps with that of ZnO at about 3.26 eV, indicates that ZnTe_xO_(1-x) forms.
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© 2007 Elsevier Ltd. All rights reserved.
International Conference on Physics of Ligh-Matter Coupling in Nanostructures (PLMCN7)(7. 2007.La Havana, Cuba).
One of the authors (A.I.) would like to thank MEC and Universidad Complutense de Madrid, Spain, for a research grant under SAB2005-0018. This research was supported by project MAT2006-01259.