Lithium-related point defects in CdTe

Abstract
Infrared absorption studies are reported for CdTe containing simultaneously a group IIIA impurity (Al, Ga or In) added during crystal growth and lithium (6Li and 7Li isotopes) introduced by diffusion. Absorption bands observed in the spectral region 250 to 330 cm-1 are explained in terms of localised vibrational modes of two kinds of defects: (i) isolated Li occurring as an interstitial species, and (ii) MCd-VCd-Lii defect complexes, where MCd denotes Al, Ga or In on a Cd site, VCd denotes a cadmium vacancy and Lii denotes lithium in an interstitial position.

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