Abstract
Metal-organic chemical vapor deposition (MOCVD) made layers of strontium–bismuth–tantalate (SBT) were characterized by spectroscopic ellipsometry (SE) using the Adachi model [S. Adachi, Phys. Rev. B 35 (1987) 7454–7463]. The evaluated optical parameters were correlated with the physical and chemical behavior examined by X-ray diffraction (XRD). As a result, it was possible to fit the measured spectra with the Adachi model in a wide range covering the region of the band gap. The Adachi model provides electronic layer parameters like the transition energy E 0 and broadening Γ. Our investigations established a correlation between XRD-determined average grain size and the electronic layer parameters.
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