Abstract
We studied the influence of air on the electrical properties of Pb 1- x Sn x Te ( x ≈ 0.20) layers deposited on a mica substrate by the hot-wall evaporation technique. Long-term measurements (for 3 years) as well as in situ measurements of the Hall coefficient, mobility and resistivity of samples with hole and electron conductivity were carried out. The variations of these parameters with time were interpreted on the basis of the results of Sun et al., i.e. by the adsorption of oxygen on the free surface, the diffusion of tin from the bulk to the surface and the surface oxidation of lead, tin and tellurium. The results of measurements were explained in terms of the phenomenological two-layer Petritz model and by energy band bending at the free surface of the layer.
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