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

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.

Automated summary

The optical properties of TlIn(S0.25Se0.75)(2) crystals were investigated using ellipsometry measurements. The crystal exhibited well-defined peaks in the X-ray diffraction pattern, indicating a monoclinic structure. Energy dependence of various linear optical parameters in the range of 1.25-4.50 eV were analyzed. The compound's band gap and Urbach energies were determined to be 1.96 and 0.68 eV, respectively, through analysis of the absorption coefficient. The refractive index spectrum was analyzed using the single-effective-oscillator model to obtain oscillator and dispersion energies, dielectric constants, and plasma frequency. Additionally, the present study revealed the nonlinear refractive index, first-order, and third-order nonlinear susceptibilities of the TlIn(S0.25Se0.75)(2) crystal.