Investigation of DC Conductivity and Non-Adiabatic Small Polaron Hopping in V 2 o 5-Seo 2-Zno Glass Nanocomposites

Content Provider	Semantic Scholar
Author	Das, Anindya Roy, Madhab Roy, Debasish Bhattacharya, Sanjib
Copyright Year	2017
Abstract	Transition metal oxide doped semiconducting glass nanocomposites with common nomenclature xV2O5-(1-x) (0.05SeO2-0.95ZnO) for x= 0.3, 0.5, 0.7, and 0.9 have been synthesized through melt quench route. Dc electrical conductivity has been measured for wide temperature range. It is perceived that Dc conductivity increases with an increment in V2O5concentration and with temperature rise, revealing semiconducting nature. The non-adiabatic hopping of small polaron is accountable for Dc electrical conduction process that is an effect of hopping of the polaron from V to V valence state in all the glassy system. The activation energies at low and high temperature, the density of states at the Fermi level, the frequency of optical phonons and Debye temperature have been estimated. The Schnakenberg’s multi-phonon supported small polaron hopping model is the best-suited model to describe the temperature dependency of the activation energy and Dc conductivity over the completely experimental temperature range. The polaron hopping parameters, for instance, polaron radius, polaron-hopping energy, polaron bandwidth etc. have been calculated. The electron-phonon coupling constant values are higher (24.4-6.64), revealing strong electron phonon interaction. It is also noteworthy that the calculated values of hopping carrier mobility and hopping carrier concentration are composition and temperature dependent.
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Language	English
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