Abstract
In this work, the oxygen treatment of 1 μm thick n-type PbTe:In films was studied. Two main processes induced during the thermal treatment in oxygen atmosphere were identified. The inversion of the type of electrical conductivity in PbTe:In films from n- to p-type was observed after the thermal treatment in oxygen ( T a=400 °C). This effect is related to indium segregation at the film surface. The photoconductivity demonstrated in PbTe:In films after oxygen treatment is due to oxygen diffusion along the grain boundaries and the creation of potential relief, which separates electron–hole pairs at the boundaries under light illumination.
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