Optical constants of silver and copper indium ternary sulfides from infrared reflectivity measurements

HASANLI N.

INFRARED PHYSICS & TECHNOLOGY, cilt.75, ss.168-172, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 75
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.infrared.2015.12.010
  • Dergi Adı: INFRARED PHYSICS & TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.168-172
  • Anahtar Kelimeler: Semiconductors, Chalcogenides, Optical properties, Infrared reflection, LATTICE VIBRATION, CUIN5S8, AGIN5S8, CRYSTALS, GROWTH, ELLIPSOMETRY, TEMPERATURE, PARAMETERS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Infrared reflection spectra are obtained in the frequency range of 50-2000 cm(-1) for AgIn5S8 and CuIn5S8 single crystals grown by Bridgman method. All four infrared-active modes are detected, which are in full agreement with the prediction of group-theoretical analysis. Spectral dependence of optical parameters; real and imaginary parts of the dielectric function, the function of energy losses, refractive index, absorption index and absorption coefficient were calculated from reflectivity experiments. The frequencies of transverse and longitudinal optical modes and oscillator strengths were also determined. The bands detected in IR spectra of studied crystals were assigned to various vibration types (valence and valence-deformation) on the basis of the symmetrized displacements of atoms obtained employing the Melvin projection operators. (C) 2016 Elsevier B.V. All rights reserved.