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Optical and electrical properties of Ge(10+x)Se40Te(50−x) thin film
Materials Chemistry and Physics • 2001
Publication Information
Authors
S.A. Fayek, M. El-Ocker, A.S. Hassanien
Keywords
Chalcogenide glasses; Optical band gap; Cohesive energy
Journal
Materials Chemistry and Physics
Publisher
Elsevier
Volume
70
Issue
Issue 2, 1 May 2001
Pages
231–235
publication.type
International
Paper Link
Open Link
Supplementary Materials
Not Available
Abstract
Thin films with thickness 100 nm of Ge(10Cx)Se40Te(50−x) (x ranging from 0.0 to 16.65 at.%) were formed by vacuum deposition at
1:33 10^−4 Pa. The change in electrical resistivity of the films has been measured using coplanar method. The measurements have been
carried out in a temperature range between 400 and 142 K. The values of the electrical activation energy lie in the range of 0.18–0.38 eV.
The optical absorption behavior of these ternary thin films were studied from the reflection and transmission. The optical band gap was
found to be in the range of 0.90–1.11 eV, and arose from indirect transitions. On the other hand, the width of the band tail Ee was found
in the range 0.19–0.32 eV, and exhibits opposite behavior. This behavior is believed to be associated with a defected bond of Te–Te and a cohesive energy (CE).
1:33 10^−4 Pa. The change in electrical resistivity of the films has been measured using coplanar method. The measurements have been
carried out in a temperature range between 400 and 142 K. The values of the electrical activation energy lie in the range of 0.18–0.38 eV.
The optical absorption behavior of these ternary thin films were studied from the reflection and transmission. The optical band gap was
found to be in the range of 0.90–1.11 eV, and arose from indirect transitions. On the other hand, the width of the band tail Ee was found
in the range 0.19–0.32 eV, and exhibits opposite behavior. This behavior is believed to be associated with a defected bond of Te–Te and a cohesive energy (CE).