Investigation of some physical and electrochromic properties of BaTiO3 perovskite thin films

In this thesis study, BaTiO3, a ceramic material with perovskite structure, Barium titanate, (BT) and graphene doped BT were coated on Indium tin oxide (ITO) coated glass substrate and Fluorine doped tin oxide (FTO) coated glass substrate by creating plasma with Thermionic Vacuum arc technique. Atomic Force Microscope, XRD Device and Raman Spectroscopy for structural properties, Filmetrics F20 interferometer for thickness value and UV-Vis spectrophotometer devices for optical properties were used to determine the surface properties of barium titanate and graphene doped barium titanate thin films grown on ITO and FTO coated glass substrates. It was determined that the roughness values of the produced films were low, their thicknesses varied between 115-187 nm and their transmittances varied between 70-80%. Electrochromic and electrochemical analyses of the produced samples were performed with Gamry Reference 3000 potentiostat. After determining the potential required for the coloration of the prepared samples in the visible region, cyclic voltammetry analyses were performed at scanning speeds of 20 mV/s, 40 mV/s, 80 mV/s and 160 mV/s. Coloration times and transmittance in the coloration state were determined by chronoamperometry analysis. Using the potentiostatic electrochemical impedance method, the Nyquist curve and equivalent circuit diagrams suitable for this curve were drawn. The life of thin films increased 15 to 30 times by doping graphene to thin films.