Kinetics of photoconductivity and metastable electronic states in Pb1-xMnxTe(In) solid solutions

The most important features of Pb1-xMnxTe(In) solid solutions are the effect of Fermi level (FL) pinning and the existence of metastable electronic states resulting in the appearance of the relaxation processes of long duration. The increase of MnTe content in Pb1-xMnxTe(In) leads to the shift of pinned FL towards the conduction band edge Ec and metal-dielectric transition at X approximately 0.05. The kinetic processes under the radiation of Pb1-xMnxTe(In) single crystals have been investigated in the temperature range 4.2-35 K. It has been found that under the composition X variation the view of kinetic curves changes qualitatively. At X 1 of the impurity center together with the ground one E2 is assumed. It is shown, that if the shift of E1 and E2 levels relatively to Ec is characterized by the linear dependence on X, the fast relaxation appears near the point when E1 level crosses Ec and enters the energy gap.