Investigating Electrical, Optical and Structural Characteristics of Cu-Doped TiO2 Nanostructured Thin Films Synthesized by Innovative Sol-Gel Process
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Abstract
Thin films of undoped and Cu-doped TiO2 (CTO) were developed in this study using an unconventional sol-gel technique. The obtained thin films are examined for their electrical, optical and structural characteristics. Both the undoped and doped thin films are confirmed to have hexagonal wurtzite structures by X-ray diffraction (XRD) analysis. Crystallites typically range in size from 15 to 30nm. The films exhibit nearly homogeneous morphologies, comprising multiple aggregates resembling flowers with nanosized multiple petals. The coefficient of absorption in the visible wavelength range decreases as the doping concentration increases, according to the optical properties. Bandgap (Eg) and extinction coefficient both show positive correlations with increasing doping concentration. The Urbach energy drops as the doping concentration rises. According to the Hall effect research, both the conductivity and the concentration of carriers grow exponentially as the amount of copper increases.
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