Transport measurements on large single crystals of Cd0.8Zn0.2Te:Cl indicate that Cl donors formDXcenters in CdZnTe. We have observed persistent photoconductivity (PPC) with an annealing temperatureTa≊130 K. Hall‐effect experiments indicate that the PPC arises from a persistent increase in the density of charge carriers; the saturation density isNsat=6×1016cm−3. The deep binding energy of theDXcenter isEd=0.22 eV. ©1995 American Institute of Physics.