Abstract
PbSe films prepared by chemical “anorganic” deposition (CAD) are investigated. The electrical resistivity (R) and the thermoelectric power (tep) are measured in a thermal dynamic regime which disturbs the equilibrium of the PbSe-oxygen system. A comparison with the behavior of PbSe films prepared by the usual chemical “organic” deposition (COD) and vacuum evaporation (VE) procedures is made. Peaks in the electrical resistivity around 170 °C (for some COD and the CAD films) and around 225 °C (for some COD and the VE films) are found, due to the super-position of the oxygen desorption process on the normal R-T dependence. The change in the sign of tep occurs before the peak in resistivity appears. These effects are discussed in terms of the “double layer” model. Based on the results from thermogravimetric and specific surface measure-ments and on oxygen isotherms for the powdered COD and CAD materials, the influence of the surface and of the bulk diffusion on the electrical properties is analysed.
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