Temperature and frequency dependence of AC electrical conductivity, dielectric permittivities, modulus and impedance parts for thermally deposited Se80S20 thin film

Abstract

In this framework, the bulk sample of Se80S20 has been successfully generated using the common melt quenching method. The main structural characteristics of Se80S20 were checked utilizing EDAX, X-ray, and SEM measurements. The thin film (~500 nm) fabricated from the bulk sample is thermally deposited on a clean glass substrate at 298 K using the evaporation technique. The thickness of the analyzed film has been monitored by a crystal monitor. On the other hand, the dielectric permittivities, dissipation factor, AC electrical conductivity, modulus, and impedance components were determined based on the capacitance-temperature (Cm-T), capacitance-frequency (Cm-ω), conductance-temperature (Gm-T), and conductance-frequency (Gm -ω) measurements. AC electrical conductivity, σAC(T) has two contributes, electronic and ionic conductivity. Physical parameters of Se and S elements have been reported. As well, the important electrical parameters such as the power of angular frequency m, the maximum barrier height Wm, energy band gap Eg, the pre-exponential factor σο, the activation energy of the conduction mechanism, EAC in both extended and hopping regions and the relaxation parameters of fresh Se80S20 thin film at different frequencies have been computed. Finally, the behavior of the local state density at the Fermi level has been studied as a function of temperature at different frequencies and also as a function of frequency at different temperatures.