Optical Characteristics of Annealed Barium Titanate Films Formed by the Sol-Gel Method

Sol-gel barium titanate films on quartz substrates annealed at 450, 600, and 700°C were studied using spectral ellipsometry and spectrophotometry in the region of intrinsic absorption bands to determine the thicknesses of surface layers, films, and film–air and fi lm–substrate transition layers. Decreases of the band gap, porosity, and thickness of the films and increases of their refractive indices and absorption with increasing annealing temperature were established. Spectra of refractive indices and absorption of the films were interpolated by dispersion formulas for new amorphous materials.

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Correspondence to N. I. Staskov.

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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 87, No. 6, pp. 918–925, November–December, 2020.

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Staskov, N.I., Sotsky, A.B., Miheev, S.S. et al. Optical Characteristics of Annealed Barium Titanate Films Formed by the Sol-Gel Method. J Appl Spectrosc 87, 1050–1056 (2021). https://doi.org/10.1007/s10812-021-01108-4

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  • optical characteristics of BaTiO3 sol-gel films
  • dispersion formulas
  • inverse optical problems
  • spectral ellipsometry
  • spectrophotometry
  • thin films on substrates of finite thickness