Characteristics of Dielectric Behavior and AC Electrical Conductivity of Bulk Antimony Sulfide (Sb2S3)

Abstract

The structural features and morphology of investigated Sb2S3 powder were analyzed using X-ray diffraction and scanning electron microscope techniques. The dependence of dielectric properties and ac conductivity of bulk Sb2S3 as pellet on both of frequency (102 –106 Hz) and temperature (303-393 K) were studied. The dielectric constant (121.2-45.8) and dielectric loss (53.3-0.89) displayed noticeable dependence on frequency and in the investigated range of temperature 303-393 K. The frequency dependence of ac conductivity σac(ω) follows up the power relation; σac(ω) = Gωs . The frequency exponent s, diminished with the rise in temperature, implying that the correlated barrier hopping (CBH) is the predominant conduction mechanism. The ac conductivity exhibited a thermally activated nature. The localized states N(EF) values were recorded in the order of 1018 eV-1 .cm-3 at specific temperatures for frequency of 800 Hz. Activation energy ΔE, calculated at different frequencies indicates a decrease from 117 meV to 89 meV with the increase in the frequency.