Abstract
The present work focuses on the comparison of the structural, optical and electrical properties nickel oxide thin films synthesized by hydrothermal and sol-gel methods and their characterizations. The films obtained from both methods are having a cubic crystal lattice. The morphological studies have shown that the films are having a uniform coverage with nanocrystalline grains. The NiO film obtained through the sol-gel method possess an optical band gap of 2.86 eV and its electrical resistance tends to decrease from 2.64GΩ to 11MΩ with an increase in temperature (RT to 150°C). The hydrothermally obtained film has an optical band gap of 3.14 eV and its electrical resistance change from 6.83GΩ to 3.86GΩ with an increase in temperature.
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