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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.

STRUCTURAL, OPTICAL AND ELECTRICAL PROPERTIES OF NANOCRYSTALLINE NICKEL OXIDE THIN FILMS PREPARED BY HYDROTHERMAL AND SOL-GEL METHODS