Meyer-Neldel Rule in Ac Conductivity of Cu Doped ZnO Thin Films


Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, vol.22, no.6, pp.1538-1543, 2018 (Peer-Reviewed Journal) identifier


Ac charge transport mechanisms have been comparatively investigated in ZnO thin films having different Cu dopant.A comparative study of the applicability of quantum mechanical tunelling and correlated barrier hopping model toobtained ac electrical conductivity results has been performed. Comparing the temperature dependence of thefrequency exponent shows that the correlated barrier hopping model best describes the experimental data on the acconductivity in ZnO:Cu thin films. In order to gain an understanding of the applicability of Meyer-Neldel rule, thedependence of the thermal activation energy on Cu doping concentration in these films has also been studied. Theobtained experimental results indicated that Meyer-Neldel rule can be succesfully applied ac conductivity data forhighly Cu doped films but not others which has been explained on the basis of distribution variations in density ofstates.