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| Effect of Thickness on Optical Properties of Nickel Oxide Thin Films
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Sakina Ibrahim Ali Abonaib , Al desogi Omer Hamed, Emtithal Ahmed Jadallah & M. A. Allhgabo Belal
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Abstract:
A thin film of Nickel Oxide (263.15, 144.9, and 90.9) nm was deposited on an FTO glass substrate using the spin coating process. Absorption coefficient, extinction coefficient, refractive index, and optical energy gap were determined using absorbance spectra collected with a UV-VIS spectrophotometer. The absorbance spectrum of all samples ranges from 200 to 400 nm, and absorbance increases with thickness, with a high absorbance value at 236 nm corresponding to photon energy 5.254 eV. The absorption coefficient ranges between 1.9×107 and 8.6×106 cm-1 for all samples. As the thickness decreases, the value increases, indicating a direct electronic transition. The maximum refractive index for all samples is 1.0222. The obtained optical energy gap value is between (3.526 and 3.358) eV, and the optical band gap decreases as the thickness of the thin film increases.
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