Features of the local structure of the Se$_{95}$Te$_5$ chalcogenide vitreous semiconductor doped with samarium

The Raman spectra of evaporated amorphous selenium films, of films of undoped Se$_{95}$Te$_5$ chalcogenide vitreous semiconductor, and of similar films doped with Sm are studied. It is shown that the Raman spectra of amorphous selenium consist of two bands with peaks at 40.5 and 254 cm$^{-1}$ and the spectra of other samples consist of three bands with peaks at 37.1–40.3, 208.8–211.9, and 248.4–253.3 cm$^{-1}$, depending on the degree of doping. The observed features are attributed to variations in the relative fractions of various structural units and to possible changes in the local structure at the level of middle- and short-range order.