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Effect of Ag additive on the density of localized states in Se-Ge glassy alloy

Published online by Cambridge University Press:  02 September 2006

V. S. Kushwaha
Affiliation:
Department of Physics, Harcourt Butler Technological Institute, Kanpur – 208 002, India
S. Kumar
Affiliation:
Department of Physics, Christ Church College, Kanpur – 208 001, India
A. Kumar*
Affiliation:
Department of Physics, Harcourt Butler Technological Institute, Kanpur – 208 002, India
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Abstract

The present paper reports the measurements on space charge limited conduction in amorphous thin films of Ge20Se$_{80-x}$Agx (x = 0, 10, 15, 20). I−V characteristics have been measured at various fixed temperatures. These characteristics show that, at low electric fields, an ohmic behaviour is observed. However, at high electric fields (E ~ 104 V/cm), the current becomes superohmic. At high fields (104 V/cm), current could be fitted to the theory of space charge limited conduction (SCLC) in case of uniform distribution of localized states in the mobility gap of these materials. Using the theory of SCLC for the uniform distribution of the traps, the density of localized states near Fermi level is calculated. It is observed that, on addition of Ag in Ge20Se80 alloy, density of localized states first increases till 10 at% of Ag and then decreases.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 2006

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