CHLORINE-RELATED HOT PHOTOLUMINESCENCE IN CDTE

Photoluminescence spectra of the (1 1 0) and (1 1 1)A CdTe single crys tals etched with a Br/methanol solution have been studied. We have fou nd a difference of the above-band-gap photoluminescence lines between the (1 1 0) and (1 1 1)A surfaces, which is due to the selection rules for phonons in CdTe. On the basis of the model which considers etchin g-related Cl to act as a non-Gamma associated defect, the hot photolum inescence beyond the fundamental absorption edge of CdTe has been inte rpreted. (C) 1998 Elsevier Science B.V. All rights reserved.