Structure of chalcogenide glasses in the As 2Se 3–CuI system

Abstract

The structure of glasses in the system As 2Se 3–CuI have been investigated using X-ray diffraction, Raman and optical spectroscopy. From the width of first sharp diffraction peak (FSDP), the correlation length ( R c ) was calculated. While R c changes with concentration of the CuI content, the position of the FSDP is nearly independent on concentration. The slope of the absorption edge and the transmission in near IR region changes drastically with addition of CuI to glassy As 2Se 3. The Raman spectra of the glasses show only vibrational modes of the AsSe 3 pyramids. Results support a model in which the network of glassy As 2Se 3 is destroyed by chemically non-reacting CuI-molecules.