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http://hdl.handle.net/10773/19362
Title: | Disorder induced violet/blue luminescence in rf-deposited ZnO films |
Author: | Peres, M. Magalhaes, S. Soares, M. R. Soares, M. J. Rino, L. Alves, E. Lorenz, K. Correia, M. R. Lourenco, A. C. Monteiro, T. |
Keywords: | PHOTOLUMINESCENCE BLUE SEMICONDUCTORS GLASS GAP |
Issue Date: | 2013 |
Publisher: | WILEY-V C H VERLAG GMBH |
Abstract: | In this work ZnO thin films were deposited on different substrates, glass, silicon (100), and MgO (100) using rf-magnetron sputtering at low temperature in order to promote a large defect density, aiming to study a possible correlation with the observed violet/blue emission band. The peak position, width and low energy band shape asymmetry of the violet/blue band was found to be dependent on the deposition temperature and oxygen partial pressure. The structural analysis of deposited films reveals an epitaxial relationship for the a-oriented ZnO/MgO while for the c-oriented ZnO/Si no epitaxial relation was found with the substrate. The dependence of the violet/blue band on temperature displays always a shift of the peak position to lower energies, discarding the hypothesis of a free to bound transition. The sublinear dependence of the emission intensity with the excitation intensity suggests that the violet/blue bands on both samples could have a donor-acceptor pair nature. However, the unusually strong shift of the peak position to lower energies for the ZnO/MgO films and the emphasised asymmetric band shape for the ZnO/Si samples suggest that potential fluctuations in the electronic bands, due to disorder induced charged defects, could also be considered as an alternative recombination model for the violet/blue band. (C) 2013 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19362 |
DOI: | 10.1002/pssc.201200873 |
ISSN: | 1862-6351 |
Publisher Version: | 10.1002/pssc.201200873 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Disorder induced violetblue luminescence in rf-deposited ZnO films_10.1002pssc.201200873.pdf | 448.4 kB | Adobe PDF |
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