Very dilute (about 1012/cm3) In donors in powder samples and monocrystals were investigated by means of 111In perturbed angular correlation spectroscopy. Most of the In atoms were located in un-complexed sites, but could form weakly-bound complexes with native defects in highly defective material. The only complex which was observed was an In-Cd vacancy pair. The CdTe in which these pairs occurred appeared to be n-type, most of the Cd vacancies were free and doubly-charged, and the binding energy with In was equal to 0.15eV. The pair formation equilibration time-constant was equal to 48h at 15C; thus implying that Cd vacancies were mobile at room temperature.

J.W.Griffith, R.Lundquist, R.Platzer, J.A.Gardner, G.Karczewski, J.K.Furdyna: Materials Science Forum, 1994, 143-147, 405-10