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Influence of heat treatment and γ-irradiation on the optical properties of methylene blue trihydrate thin films

Published online by Cambridge University Press:  05 February 2008

A. F. El-Deeb ,
M. M. El-Nahass ,
M. A. Kamel  and
S. Y. Huthaily
A. F. El-Deeb*
Affiliation:
Physics department, Faculty of Education, Ain Shams University, Roxy 11757 Cairo, Egypt
M. M. El-Nahass
Affiliation:
Physics department, Faculty of Education, Ain Shams University, Roxy 11757 Cairo, Egypt
M. A. Kamel
Affiliation:
Physics department, Faculty of Education, Ain Shams University, Roxy 11757 Cairo, Egypt
S. Y. Huthaily
Affiliation:
Physics department, Faculty of Education, Ain Shams University, Roxy 11757 Cairo, Egypt
*
[email protected]
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Abstract

Structural and optical properties of thermally evaporated methylene blue trihydrate thin films up to a film thickness of 165 nm have been investigated. The lattice constants and the crystallite size were calculated. The optical parameters were obtained using spectrophotometric measurements of the transmittance and reflectance at normal incidence of light in the wavelengths range 200–2500 nm. Below the absorption edge, subgap absorption in the energy range 0.75–1.4 eV was observed and interpreted in terms of defect states induced absorption phenomena and act as deep traps for charge carriers. The type of optical transition was found to be an indirect allowed transition. The values of the optical gap E opt , the transport gap E t , the exciton binding energy E B , the Urbach's energy E u and the dispersion parameters for as-deposited, annealed and irradiated films with different doses of γ-irradiation were estimated and discussed their influenced by heat treatment and irradiation.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 41 , Issue 1 , January 2008 , pp. 33 - 40
Copyright
© EDP Sciences, 2008

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