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AC conductivity and dielectric studies of Cd 0.8 Sn 0.2 S thin films
Author(s) -
Amroun Mohamed Nadhir,
Khadraoui Mohammed
Publication year - 2019
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.2617
Subject(s) - activation energy , conductivity , dielectric , arrhenius plot , analytical chemistry (journal) , dielectric spectroscopy , arrhenius equation , electrical resistivity and conductivity , materials science , thin film , relaxation (psychology) , capacitance , condensed matter physics , atmospheric temperature range , thermal conduction , dielectric loss , nuclear magnetic resonance , chemistry , electrode , thermodynamics , electrical engineering , physics , composite material , electrochemistry , optoelectronics , psychology , chromatography , nanotechnology , engineering , social psychology
Abstract Thin films of Cd 0.8 Sn 0.2 S were prepared by spray pyrolysis method. The Dc and Ac electrical conduction of Cd 0.8 Sn 0.2 S thin films was investigated in this work. Ac conductivity study of the prepared sample is reported in the frequency range 5 Hz to 13 MHz at various temperatures (300‐343 K) using impedance spectroscopy. The Cole‐Cole plot shows a single semicircle, indicating an equivalent circuit with a single parallel resistor R and capacitance C. Ac conductivity Ac(ω) is found to be proportional to ω s where s < 1. The value of s tends to decrease depending on the temperature. The temperature dependence of both the Ac conductivity and the parameter s is interpreted by the correlated barrier hopping (CBH) model. The temperature‐dependent Dc conductivity and the relaxation frequency are found to obey the Arrhenius law having activation energy of 0.17 eV. The density of states at Fermi level is calculated and is of the order of 10 15 eV −1 ·cm −3 . Dielectric constant ε′ and dielectric loss ε″ were found to decrease with frequency and increase with temperature in the investigated ranges.