Temperature and concentration dependences of charge carrier mobility in solid solutions (PbS)1–x(Sm2S3)x

Abstract

The temperature dependences of electrical conductivity, Hall coefficient, and charge carrier mobility (μH) have been investigated in cast and pressed samples of solid solutions (PbS)_1–x(Sm₂S₃)_x with x = 0–0.04. For pressed samples (x = 0.001–0.0016) in the temperature range 77–200 K, an anomalous exponential increase in μH is observed with increasing temperature, which is explained by the presence of energy barriers created by oxide films at grain boundaries. In the dependences of μH on Sm₂S₃ content in the composition range 0.1–0.16%, anomalies were detected that are associated with a concentration-induced phase transition of the percolation type.