Study on local structure in amorphous SbS films by Raman scattering

A stoichiometric Sb₄₀S₆₀ film contains SbSb and SS bonds in addition to SbS bonds in an SbS₃ unit. The amount of the SbSb bond rapidly decreases with an increase in the S content beyond the stoichiometric value. On the other hand, as the S content decrease beyond the stoichiometric value, the SbS bond decreases and the SbSb bond increases. Annealing at temperatures near the glass transition decreases the fraction of the SbSb bond in the Sb₄₀S₆₀ film.