Identification of the chlorine<i>A</i>center in CdTe

Abstract

The chlorine A center has been identified in CdTe using photoluminescence and optically detected magnetic-resonance techniques. The A center is found to be an acceptor with a binding energy ${\mathit{E}}_{\mathit{a}}$=120\ifmmode\pm\else\textpm\fi{}3 meV and consists of a Cd vacancy and a Cl donor on a nearest Te site. The defect has trigonal symmetry with ${\mathit{g}}_{\mathrm{?}}$=2.2 and ${\mathit{g}}_{\mathrm{\ensuremath{\perp}}}$=0.4, assuming an effective spin S=1/2. The interactions with the three Te neighbors are also resolved and the measured isotropic ligand hyperfine interaction amounts to (2.7\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}2}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$.