Optical properties of PbTiO₃ thin films prepared by a modified sol-gel processing

Uniform and transparent PbTiO₃ amorphous thin films were deposited on the quart glass substrate using a modified sol-gel processing. The optical properties of PbTiO₃ amorphous thin films were investigated in detail. The refractive index was calculated and in good agreement with Cauchy function. The optical band gap of the PbTiO₃ amorphous thin films was obtained about 3.84 eV using semiconductor theoretical calculation. The FTIR spectrum investigation of the PbTiO₃ amorphous thin films shows that no absorption appears in the mid-infrared region. Six IR active phonon modes were observed in the PbTiO₃ thin films annealed at 550°C by far-infrared reflectance spectra.