Effect of doping concentration for the properties of Fe doped TiO2thin films applications

Abstract

This paper reports the sol-gel preparation and subsequent characterization of Fe doped TiO2thin films with different doping concentrations (1%, 3% and 5%). X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray analysis (EDX), UV-Visible analysis and Photoluminescence spectra analysis (PL) were used to characterize the prepared samples. The crystallite size of anatase phase increases from 4.76nm to 7.61nm when doping concentration increases from 1% to 3% and the anatase phase is transformed to brookite at the doping of 5% as the crystallite size of more than 14.82nm. The surface morphological pictures are observing to be almost smooth and particle size dispensation of Fe doped titanium dioxide particles is non-spherical agglomeration crystallite formation. An optical band gap of 3.63eV, 3.41eV and 3.11eV were obtained for the TiO2thin films doped with 1%, 3% and 5% Fe respectively. PL analysis results the emission peaks at 347nm for 1% Fe doped sample seems to shift slightly towards higher wavelength for 3% and 5% Fe doped samples. This may be due to reduction in bandgap because of the shallow trap state created near the absorption band edge as a result of doping.

Publication Title

Materials Today: Proceedings

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