Ahmed ٍSaeed Hassanien
Prof. Emeritus
THE DEPENDENCE OF OPTICAL GAP UPON COMPOSITION AND FILM THICKNESS OF [(PbTe)1-x (PbSe)x ] thin films
Bulletin of Faculty of Science - Zagazig University • 1991
Publication Information
Authors
M.M. EL Okr, T. Bayomy, F.Metawe, A.S. Hassanien
Keywords
Thin films, Thermal evaporation, Optical energy gap, Band structure
Journal
Bulletin of Faculty of Science - Zagazig University
Publisher
Zagazig University
Volume
13
Issue
2, Dec.
Pages
23
publication.type
Local
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
Thin films of [(PbTe)1-x(PbSe )x] have been prepared by thermal evaporation of about 1.3x10^ -3 Pa. Film thicknesses have been determined using multiple -beam Fizeau fringes at reflection. The thickness of the films were ranged between 60 nm and 180 nm. X-ray diffraction patterns reveal the formation of polycrystalline films. Optical gap has been estimated. It was found that the gap depends on the film thickness. The obtained results are discussed in terms of the band structures of PbTe and Pbse.