Optical characterization of CuIn5S8 crystals by ellipsometry measurements


IŞIK M., Gasanly N.

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, cilt.91, ss.13-17, 2016 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 91
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.jpcs.2015.11.020
  • Dergi Adı: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
  • Sayfa Sayıları: ss.13-17

Özet

Optical properties of CuIn5S8 crystals grown by Bridgman method were investigated by ellipsometry measurements. Spectral dependence of optical parameters; real and imaginary parts of the pseudodielectric function, pseudorefractive index, pseudoextinction coefficient, reflectivity and absorption coefficients were obtained from the analysis of ellipsometry experiments performed in the 1.2-6.2 eV spectral region. Analysis of spectral dependence of the absorption coefficient revealed the existence of direct band gap transitions with energy 1.53 eV. Wemple-DiDomenico and Spitzer-Fan models were used to find the oscillator energy, dispersion energy, zero-frequency refractive index and high-frequency dielectric constant values. Structural properties of the CuIn5S8 crystals were investigated using X-ray diffraction and energy dispersive spectroscopy analysis. (C) 2015 Elsevier Ltd. All rights reserved.