Optical and electrical properties of sol-gel derived BaTiO3 films on ITO coated glass

BaTiO3 films have been deposited on ITO coated glass by sol-gel method usin g barium acetate and titanium butoxide as starting materials. The optical p roperties were studied by UV-VIS-NIR spectroscopy and the results indicated that the films had high transparency in the visible spectral zone. From th e UV-VIS absorption data, the band gaps of the films were determined to be in the range of 3.72-3.77 eV, depending on the annealing temperature and ti me. Electrical measurements revealed that dielectric constants of the films increased with the increase of annealing time and temperature and reached a value of 180, but the breakdown voltage decreased from 100 x 10(6) to 12. 5 x 10(6) V m(-1) at the same time. (C) 2000 Published by Elsevier Science S.A. All rights reserved.