PHOTOELECTRICAL PROPERTIES OF TlInS₂-LAYERED SINGLE CRYSTALS

Abstract

TlInS 2-layered single crystals were prepared by using a special technique for crystal growth, and the obtained crystals were analyzed by X-ray diffraction. The reflectance and transmittance spectra were measured for the mentioned layered crystals and analyzed over the incident photon energy range 1.96–2.46 eV and in the temperature range 77–300 K. In this work and with the aid of these spectra, the temperature dependence of optical transports and parameters were investigated. In line with the transmittance and reflectance analyses, the refractive index as a function of wavelength was determined in the low-energy region of the studied incident photon energy range. As results of the refractive index–wavelength variations, the oscillator and dispersion energies of the refractive index for the TlInS 2-layered single crystals were determined in the temperature range under investigation. Thereafter, static refractive index and static dielectric constant were also investigated.

AC Photoconductivity Measurements of TlInS2 Single Crystals

“…Badr et al [9] recently investigated the photoelectric properties of TlInS 2 layered single crystal, where the transmittance and reflectance spectra of TlInS 2 crystals were measured in the photon energy range 1.96-2.46 eV over the temperature range 77-300 K. The type of optical transition was marked and found to be an indirect allowed one. Optical properties of TlInS 2 layered single crystals have been studied by El-Nahass et al [10]; absorption spectra of thin layers of TlInS 2 crystals are used to study the energy gap and the inter band transitions of the composition in the energy region 2-2.4 eV.…”

Influence of photonic excitations on the electrical parameters of TlInS2 crystals

“…TlInS 2 ternary crystals have attracted much attention in the last decade [1][2][3][4][5][6][7][8][9][10]. Recently, the structural studies on the crystal have succeeded in converting the crystal structure to orthorhombic and tetragonal modifications from its monoclinic phase [1].…”

“…Particularly, the band gap of orthorhombic TlInS 2 is reported as 2.52 eV whereas that of tetragonal TlInS 2 is 1.87 eV which is noticeably lower than the band gap of monoclinic TlInS 2 (2.33 eV [5]). Due to the tunable band gap, the optoelectronic properties of these crystals have been studied in details [2,4,6,7].…”