Spectroscopic ellipsometry studies of optical properties of TlIn(S0.25Se0.75)2 crystal

Guler I., Isik M., HASANLI N.

Applied Physics A: Materials Science and Processing, cilt.129, sa.6, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 129 Sayı: 6
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1007/s00339-023-06729-4
  • Dergi Adı: Applied Physics A: Materials Science and Processing
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex
  • Anahtar Kelimeler: 2D materials, Bandgap energy, Ellipsometry, Optical constants, TlInS2, TlInSe2
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The optical properties of TlIn(S0.25Se0.75)2 crystals were studied by ellipsometry measurements. X-ray diffraction pattern presented well-defined peaks associated with monoclinic structure. Energy dependent graphs of various linear optical parameters of the crystal were presented in the 1.25–4.50 eV range. The band gap and Urbach energies of the compound were found as 1.96 and 0.68 eV, respectively, from the analyses of the absorption coefficient. Refractive index spectrum was analyzed considering the single-effective-oscillator model to get oscillator and dispersion energies, zero and high frequency dielectric constants, plasma frequency. Moreover, the nonlinear refractive index, first-order and third-order nonlinear susceptibilities of TlIn(S0.25Se0.75)2 crystal were revealed in the present paper.