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Composition and electric field effects on the transport properties of Bi doped chalcogenide glasses thin films.

مؤلف البحث
MM Hafiz, AA Othman, MM Elnahass, AT Al-Motasem
ملخص البحث

The temperature dependence of the DC electrical conductivity σDC was measured in the temperature range from 300–500 K. It was found that there are double activation energies, Eσ, for Ge20Se80−xBix (x=0, 2.5 and 5 at%) films, while there is single activation energy for Ge20Se72.5Bi7.5. when incorporation of Bi=7.5 at%, the pre-exponential value σ0 decreases by about six order of magnitude, the activation energy in the extended states Eσ decreases from 0.96 to 0.09 eV. Also the effect of applied electric field was studied and observed that, activation energy in high temperature region increases with increasing electric field; this behavior can be understood assuming that the contribution to the conductivity activation process is due to conduction in the extended states and also due to hopping in the localized states. With the increasing electric field, as former process, which is having high activation energy …

تاريخ البحث
قسم البحث
مجلة البحث
Physica B: Condensed Matter
المشارك في البحث
عدد البحث
390
سنة البحث
2007
صفحات البحث
286-292