Study of Optical Properties of NiO and Ni0.92Zn0.08O Thin Films Prepared by Pulsed Laser Deposition via Kramers–Kronig Analysis
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Abstract
NiO and Ni0.92Zn0.08O thin films were deposited onto glass substrates using pulsed laser deposition in vacuum. The optical properties were investigated using the Kramers-Kronig relations, with the phase shift angle computed numerically in MATLAB. The results revealed noticeable variations in the optical behavior due to zinc doping, as confirmed by differences in the refractive indices: 2.52 and 2.57 at 630 nm for the undoped and doped films, respectively. Moreover, the optical band gap decreased from 3.51 to 3.39 eV, and the dielectric constant was also calculated. X-ray diffraction (XRD) analysis confirmed the polycrystalline nature of the prepared films, while field emission scanning electron microscopy (FESEM) images revealed a surface morphology characterized by nanoscale grains. Moreover, energy-dispersive X-ray spectroscopy (EDX) and Fourier-transform infrared (FTIR) spectroscopy were performed to verify the elemental composition and investigate the chemical bonding of both films.
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