On the stretched-exponential decay kinetics of the ionized DX centers in gallium doped Cd_(1-x)Mn_xTe

摘要

Non-exponential persistent photoconductivity decay kinetics in gallium doped Cdo.99Mno.o1Te 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.