On the stretched-exponential decay kinetics of the ionized DX centers in gallium doped Cd1−xMnxTe

Abstract

Non-exponential persistent photoconductivity decay kinetics in gallium doped Cd 0.99 Mn 0.01 Te mixed crystals were studied at various temperatures and photon fluxes. It was found that the phototransients exhibit the stretched-exponential pattern and can be fitted by means of the Kohlrausch―Williams-Watts Φ(t)=exp(―t/τ) α , 0 < α < 1 function. The stochastic approach to relaxation processes was proposed to give the physical interpretation of the stretching-exponent α and its relation to the DX centers relaxation rates distribution.