Optical and electrical properties of sol-gel spin coated titanium dioxide thin films

摘要

In this work; Ti02 thin films were deposited on glass and stainless steel substrates by sol-gel spin coating method.The films deposited on glass were annealed at different temperatures (T_a) in the range of 200 to 500 °C and that are deposited on steel substrate were annealed at 800 °C. The optical properties of TiO2 thin films were studied by using UV-VIS spectroscopy and photoluminescence (PL) spectroscopy. The transmittance on the average was found to > 80 % and is found to sensitive to T_a, The PL spectra exhibited the strong emission band associated with band- to- band transition around 390 ran and the two weak bands at 480 and 510 nm associated to the oxygen defects and surface defects respectively. The current-voltage (I-V) characteristics of the Al/TiO2/teel capacitors were studied and analysed with application of various current mechanisms. Analysis reveals that the conduction in Al/TiO2/steel capacitors is governed by Poole-Frenkel mechanism.