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In this article, we present a comprehensive study of temperature andcomposition dependent Raman spectroscopy of GexAs35-xSe65 thin films tounderstand different structural units responsible for optical properties.Strikingly, our experimental results uncover the ratio of GeSe4/2 tetrahedraland AsSe3/2 pyramidal units in GexAs35-xSe65 thin films and their linearscaling relationship with temperature and x. An important notable outcome ofour study is the formation of Se8 rings at lower temperatures. Our experimentalresults further provide interesting optical features, thermally andcompositionally tunable optical absorption spectra. Detailed structure specificFIR data at room temperature also present direct information on the structuralunits in consistent with Raman data. We foresee that our studies are useful indetermining the lightinduced response of these films and also for theirpotential applications in optics and optoelectronics.

Investigation of Temperature Dependent Optical Modes in GexAs35-xSe65 Thin Films: Structure Specific Raman, FIR and Optical Absorption Spectroscopy