Effect of annealing on structural and optical properties of WO3 thin films prepared by electron-beam coating

Thin films of WO3 were deposited on glass substrates by the electron-beam evaporation technique. Three annealing temperatures, of 673, 723 and 773K, were used for different films. Two kinds of annealing were used: in air and under vacuum. The influence of the annealing temperature on the structure a...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2007-04, Vol.391 (2), p.199-205
Main Authors: JORAID, A. A, ALAMRI, S. N
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Insulators
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of specific thin films
Physics
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Summary:Thin films of WO3 were deposited on glass substrates by the electron-beam evaporation technique. Three annealing temperatures, of 673, 723 and 773K, were used for different films. Two kinds of annealing were used: in air and under vacuum. The influence of the annealing temperature on the structure and optical properties of the WO3 was studied. The surface morphology of the thin films was investigated by atomic force microscopy, which showed that molecule size depends on the air pressure and the annealing temperature. Spectrophotometric measurements of transmittance and reflectance were carried out in the wavelength range 190-2500nm. The refractive index, n, and the change in optical density, DeltaOD, were found to be dependent on annealing temperature. The energy gap Eg decreased with increasing annealing temperature.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2006.09.010