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Issue 30, 2018
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Enhancement of polaron-hopping-based a.c. conduction in semiconducting STS (Se–Te–Sn) glass by silver incorporation

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Abstract

In the present work, we have synthesized novel Se78−xAgxTe20Sn2 (0 ≤ x ≤ 6) semiconducting glasses for improving thermally activated a.c. conduction in STS glass (x = 0). The results of the experimental analysis of thermally activated a.c. conduction have been reported in terms of frequency and temperature of Se78−xAgxTe20Sn2 (0 ≤ x ≤ 6) glasses. The frequency dependent experimental data of a.c. conductivity σac show that σac follows the Jonscher universal power law. Variation of a.c. conductivity with temperature obeys the Arrhenius relation. Further analysis confirms that the density of defect states can be determined on the basis of a correlated barrier hopping model using the frequency/temperature dependence of a.c. conductivity σac (T,ω). The analysis of composition dependence of various electric parameters like potential barrier height Wm, hopping distances Rmin and Rω, dielectric constant (ε′) and the density of defect states N shows that hopping conduction is improved after silver incorporation into the parent glass. This is explained in terms of a dipolar model by considering the dipoles of Ag+ ions with negatively charged defect states.

Graphical abstract: Enhancement of polaron-hopping-based a.c. conduction in semiconducting STS (Se–Te–Sn) glass by silver incorporation

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Publication details

The article was received on 22 Feb 2018, accepted on 04 Jul 2018 and first published on 17 Jul 2018


Article type: Paper
DOI: 10.1039/C8DT00717A
Citation: Dalton Trans., 2018,47, 10187-10194

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    Enhancement of polaron-hopping-based a.c. conduction in semiconducting STS (Se–Te–Sn) glass by silver incorporation

    A. Srivastava and N. Mehta, Dalton Trans., 2018, 47, 10187
    DOI: 10.1039/C8DT00717A

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