Abstract
In this article, the optical properties of polycrystalline thin films based on PbTe with disturbed stoichiometry are considered. It is shown that in PbTe films with a lead excess of 1.2 wt %, the intrinsic absorption edge is shifted to shorter wavelengths of the spectrum, and this is due to the presence of shallow levels in the forbidden band. It was found that in the band of p-type PbTe spectra with an excess of tellurium of 2.8 and 3.8 wt %, there are additional bands with the cutoff energy hw=0.132 eV, which are associated with the presence of free tellurium.
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