Doping of Cadmium Telluride with Germanium,Tin, and Lead

The transition of Ge-, Sn-, and Pb-doped CdTe crystals to semi-insulating behavior is analyzed in terms of a charge compensation model which includes shallow donor and acceptor states and defects with midgap energy levels. Model predictions are compared with experimental resistivity data for different doping levels. The deep levels are assumed to be due to dopant atoms. The results indicate that deep stoichiometric defects (V _Cd and Te_Cd) have an insignificant effect on the electrical properties of the material.