OPTICAL PROPERTIES OF MONOCLINIC In2Te5

Optical properties of semiconducting compound In2Te5 with monoclinic structure were investigated: absorption and photoluminescence near fundamental edge at 1.3n1.7 eV were registered and spectroscopic ellipsometry measurements in spectral range of 1n5 eV were performed. It has been concluded that three oscillators in the mentioned spectral range are responsible for the optical singularity in dielectric function of investigated compounds, one of which is very weak. The contributions of other optical transitions were estimated as constants in dielectric function. A possible ascription of investigated optical transitions for several symmetry points of In2Te5 Brillouin zone is discussed.