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http://hdl.handle.net/11154/2625
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Title: | Growth, structure and optical characterization of high quality ZnO thin films obtained by spray pyrolysis |
Authors: | Paraguay, F Estrada, W Acosta, DR Andrade, E Miki-Yoshida, M |
Issue Date: | 1999 |
Abstract: | Zinc oxide thin films were prepared by spray pyrolytic decomposition of zinc acetate onto a glass substrate. Auger spectroscopy showed that the film stoichiometry is close to the ZnO phase with a little excess of oxygen. X-ray diffraction spectra show that the structure belongs to the hexagonal wurtzite crystal type, with a mean crystallite size in the range 20-33 nm. Under optimized deposition conditions films are c-axis oriented, having a full width at half-maximum (FWHM) value of the (002) X-ray diffraction line of 0.23 degrees. Microstructure was analysed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high resolution electron microscopy (HREM). In regard to the crystal growth, a critical temperature was found to he around 600 K. Above this critical temperature the film is c-axis oriented and almost all grains became round shaped. Optical constants, n and k, were determined using only transmittance data and a direct band gap of 3.28 eV was deduced. (C) 1999 Elsevier Science S.A. All rights reserved. |
URI: | http://hdl.handle.net/11154/2625 |
ISSN: | 0040-6090 |
Appears in Collections: | Ciencias
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