Raman spectroscopy studies of Ge-As-S chalcogenide glasses

In this study the Raman spectroscopy is employed to investigate the structural properties of Ge-As-S chalcogenide glasses. Obtained Raman data show that studied chalcogenides are nanostructurized materials. Raman spectra of Ge-As-S samples showed that the backbones of the studied samples consist of AsS_3/2 pyramidal units, edge- and corner-shared Ge(S_1/2)₄ tetrahedral units. Compositional changes in studied glasses result in the evolution of the observed Raman bands. Such dependences of characteristic constituent Raman bands' intensities showed that Ge-As-S samples contain different nanophases whose concentration is changing along chosen compositional cross-section.