Meyer-Neldel rule in ac conductivity of Cu doped ZnO thin films

Yıl 2018, Cilt: 22 Sayı: 6, 1538 - 1543, 01.12.2018

Nursel Can Birsel Can Ömür Ahmet Altındal

https://doi.org/10.16984/saufenbilder.322378

Öz

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 to obtained ac electrical
conductivity results has been performed.
Comparing the temperature dependence of the frequency exponent shows that the correlated
barrier hopping model best describes
the experimental data on the ac conductivity in ZnO:Cu thin films. In order to
gain an understanding of the applicability of Meyer-Neldel rule, the dependence
of the thermal activation energy on Cu doping concentration in these films has
also been studied. The obtained experimental results indicated that
Meyer-Neldel rule can be succesfully applied ac conductivity data for highly Cu
doped films but not others which has been explained on the basis of
distribution variations in density of states.

Anahtar Kelimeler

Meyer-Neldel rule, transport mechanism, ZnO

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

Öz

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 to obtained ac electrical
conductivity results has been performed.
Comparing the temperature dependence of the frequency exponent shows that the correlated
barrier hopping model best describes
the experimental data on the ac conductivity in ZnO:Cu thin films. In order to
gain an understanding of the applicability of Meyer-Neldel rule, the dependence
of the thermal activation energy on Cu doping concentration in these films has
also been studied. The obtained experimental results indicated that
Meyer-Neldel rule can be succesfully applied ac conductivity data for highly Cu
doped films but not others which has been explained on the basis of
distribution variations in density of states.

Anahtar Kelimeler

Meyer-Neldel rule, ac charge transport mechanism, ZnO, thin film

Kaynakça

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