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Observation of Meyer-Neldel rule in amorphous filmsof Ge1–x Se2Pbx

Published online by Cambridge University Press:  14 January 2009

M. M. El-Nahass*
Affiliation:
Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt
H. M. Abd El-Khalek
Affiliation:
Physics Department, Faculty of Science, Suez Canal University, Port-Said, Egypt
H. M. El-Mallah
Affiliation:
Department of Physics & Mathematical Engineering, Faculty of Engineering, Suez Canal University, Port-Said, Egypt
F. S. Abu-Samaha
Affiliation:
Department of Physics & Mathematical Engineering, Faculty of Engineering, Suez Canal University, Port-Said, Egypt
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Abstract

Electrical conductivity was performed on amorphous thin films of Ge1–x Se2Pbx (with x = 0, 0.2, 0.4, 0.6 and 0.8) as a function of temperature in the range 300–450 K. The experimental results indicate that the conduction is through thermally activated process having two conduction mechanisms. In the first region at high-temperatures range, the values of $\sigma _{o}$ suggest that the dominant conduction of charge carriers changes from the extended states to the localized states in the band tails at composition x = 0.8. The experimental results have also been analyzed using Meyer-Neldel Rule. The other one appears in the low temperatures region and the conductivity has been analyzed using Mott's variable range hopping conduction. Mott's parameters were calculated for Ge1–x Se2Pbx films.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 2008

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