Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 125, Issue 9, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-019-2911-3
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In this paper, thin films of lithium-doped zinc oxide (ZnO: Li) were prepared by spray pyrolysis in a monophase hexagonal wurtzite structure as shown by X-ray analysis. Rietveld refinement of the X-ray diffraction diagram was applied to calculate the crystalline structure parameters. Impedance spectroscopy, electrical conductivity and dielectric measurements, at various temperatures 340-440 degrees C and in a frequency spectrum from 5Hz to 1MHz, were performed using the EC-Lab V10.12 system. During the electrical conduction processes in the sample, the physical parameters of ZnO:Li thin films such as dielectric constant, relaxation frequency and electrical conductivity sigma(ac) and sigma(dc), were examined. In addition, AC conductivity analysis resulted in a power law (sigma(ac)=omega(s)). Obviously, the temperature dependence of the exponent s fitted well with the correlated barrier hopping (CBH) model proposed by Elliott. Finally, the dependence of conductivity and dielectric constants with frequency and temperature was discussed.
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