Temperature-dependent photocurrent decay in PbSnTe:In films

The temperature-dependent photocurrent decay in PbSnTe:In films has been studied in the interval of temperatures T≈20-30 K at each implemented temperature having been stabilized accurate to ΔT≈0.01 K. The time constant of the process, whose value in the examined temperature interval proved to be ranging from ≈1.0 s to ≈200 s, was measured. The behavior displayed by the curve τ(T) is discussed on the assumption that, in the examined interval of temperatures, a ferroelectric transition occurs in PbSnTe:In.