Effect of Sr doping on electronic transport properties of SnS2 hexagonal nanoplates

Abstract

In this work, the electronic transport properties of SrxSn1-xS2 (x = 0, 0.02, 0.04, 0.06 and 0.08) nanoplates synthesized by hydrothermal method have been reported. AC conductivity, electric modulus and impedance spectra nanoplates have been studied in frequency and temperature ranging from 1Hz to 1 MHz and 313K–453K, respectively. AC conductivity data of the SrxSn1-xS2 nanoplates obeys the Almond-West relationship. In SrxSn1-xS2 nanoplates conduction governs by overlapping large-polaron tunnelling (OLPT), quantum mechanical tunnelling (QMT) and small polaron quantum mechanical tunnelling (SPQMT) mechanisms for x = 0, x = 0.02 and x = 0.04, 0.06 and 0.08, respectively. A modified KWW model has been used to understand the electric modulus behaviour of SrxSn1-xS2 nanoplates. The observed scaling behaviour of the imaginary component of the electric modulus supports the assertion of frequency exponent (s) with temperature about the conduction mechanism. The Nyquist plots are well-fitted with a double R-CPE model. The activation energy values estimated from conductivity (0.68–0.73 eV) and electric modulus (0.69–0.72 eV) analysis are in coherence.