These important examples of II-VI compounds were investigated by using positron lifetime spectroscopy. In particular, the Hg vacancies in HgCdTe were extensively studied. Their distribution was measured in entire travelling heater grown ingots, and the iso-concentration lines of Hg vacancies in the vapor pressure diagram were determined. It was found that Ag atoms filled all of the available Cd vacancies in CdTe during diffusion at room temperature. A vacancy defect was identified as being part of the Cl A-center in Cl-doped CdTe. It was of neutral charge state, and was thought to have the structure, (VCd-ClTe+). Only a small fraction (less than 10%) of the Cl dopant formed these complexes.

R.Krause-Rehberg, T.Drost, A.Polity: Materials Science Forum, 1994, 143-147, 429-34