Journal of Materials Science: Materials in Electronics

, Volume 22, Issue 9, pp 1415-1419

First online:

Effect of annealing temperature on electrical and nano-structural properties of sol–gel derived ZnO thin films

  • M. VishwasAffiliated withDepartment of Physics, Govt. Science College Email author 
  • , K. Narasimha RaoAffiliated withDepartment of Instrumentation and Applied Physics, Indian Institute of Science
  • , A. R. PhaniAffiliated withNano-Research for Advanced Materials Technologies
  • , K. V. Arjuna GowdaAffiliated withDepartment of Physics, Govt. College for Women
  • , R. P. S. ChakradharAffiliated withCSIR-NAL Email author 

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Zinc oxide (ZnO) thin films have been prepared on silicon substrates by sol–gel spin coating technique with spinning speed of 3,000 rpm. The films were annealed at different temperatures from 200 to 500 °C and found that ZnO films exhibit different nanostructures at different annealing temperatures. The X-ray diffraction (XRD) results showed that the ZnO films convert from amorphous to polycrystalline phase after annealing at 400 °C. The metal oxide semiconductor (MOS) capacitors were fabricated using ZnO films deposited on pre-cleaned silicon (100) substrates and electrical properties such as current versus voltage (I–V) and capacitance versus voltage (C–V) characteristics were studied. The electrical resistivity decreased with increasing annealing temperature. The oxide capacitance was measured at different annealing temperatures and different signal frequencies. The dielectric constant and the loss factor (tanδ) were increased with increase of annealing temperature.