title: Optical and photoconductivity spectra of novel Ag₂In₂SiS₆ and Ag₂In₂GeS₆ chalcogenide crystals.
abstract: Complex spectral studies of near-band gap and photoconductive spectra for novel Ag(2)In(2)SiS(6) and Ag(2)In(2)GeS(6) single crystals are presented. The spectral dependences of photoconductivity clearly show an existence of spectral maxima within the 450 nm-540 nm and 780 nm-920 nm. The fundamental absorption edge is analyzed by Urbach rule. The origin of the spectral photoconductivity spectral maxima is discussed. Temperature dependences of the spectra were done. The obtained spectral features allow to propose the titled crystals as photosensors. An analysis of the absorption and photoconductivity spectra is given within a framework of oversimplified spectroscopic model of complex chalcogenide crystals.
authors.affiliation: Central School of the State Fire Service, Sabinowska 62, Czestohcowa, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Chmiel
authors.forename: M
authors.initials: M
authors.lastname: Piasecki
authors.forename: G
authors.initials: G
authors.lastname: Myronchuk
authors.forename: G
authors.initials: G
authors.lastname: Lakshminarayana
authors.forename: Ali H
authors.initials: AH
authors.lastname: Reshak
authors.forename: O G
authors.initials: OG
authors.lastname: Parasyuk
authors.forename: Yu
authors.initials: Y
authors.lastname: Kogut
authors.forename: I V
authors.initials: IV
authors.lastname: Kityk
mesh_terms: D003460:Crystallization; D005857:Germanium / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D012666:Semiconductors; D012825:Silicon / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013057:Spectrum Analysis; D013455:Sulfur / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D005857:Germanium; D007204:Indium; D012834:Silver; D013455:Sulfur; D012825:Silicon