A model was proposed for metastable DX centers which formed via Jahn–Teller distortion of the crystal lattice. That is, by displacement of a DCd residual donor impurity (with D a group-III element) to the region of a nearest-neighbor interstice. The configuration-coordinate diagram for a VCd–Di associated defect was constructed, while taking account of the tetrahedral and hexagonal positions of interstitial atoms. The Stokes shift, n-type conductivity, Fermi-level location, photoluminescence and other effects were explained in terms of this diagram. The results were in agreement with experiment, for the energy spectrum of DX centers.

Metastable X Centers in Cadmium Telluride Single Crystals. P.N.Tkachuk, V.I.Tkachuk, P.N.Bukivsky, M.V.Kurik: Physics of the Solid State, 2004, 46[5], 825-32