Electrical properties of lead telluride single crystals doped with bromine, M.K. Sharov, A.M. Samoylov, O.B. Yatsenko,  Voronezh State University, Universitetskaya Sq., 1, 394006 Voronezh, Russian Federation.

PbTe single crystals doped with VII A Periodic system group elements will continue to attract a widespread attention both for their fundamental electronic properties  and for the applications in  infrared (IR) optoelectronic. Under influence of the presence of bromine the electrical parameters of PbTe and its solid solutions can change significantly. However some fundamental problems of the formation, saturation and influence of quasi-local impurity levels in Br-doped PbTe have not been resolved yet.

The dependence of thermo-power factor and electrical conductivity upon the concentration of bromine atoms in the single crystals of PbTe_1-xBr_x solid solutions has been studied in this work. The electron density relating to the content of bromine atoms in PbTe_1-xBr_x samples has been estimated on the basis of experimental results. The values of thermo-power factor tend to reduction with increasing in concentration of bromine. On the contrary, the electrical conductivity and electron densities increase sharply after injecting the bromine atoms in РbТе matrix. It has been established that at x > 0.03 the all studied electrical parameters do not undergo the changes.

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