High-resolution infrared absorption measurements of Al-doped ZnSe

Infrared absorption measurements of localized vibrational modes (LVM) due to Al in ZnSe performed under high-resolution conditions reveal additional features as compared to previous data. The cluster of bands near 340 cm−1 is resolved into at least six and possibly eight individual absorptions. A Green’s function calculation over various pertinent models best explains most of these LVM as probably arising from a (2 AlZn-ZnSe) antisite complex (or at least an AlZn pair) with other complexes less likely. The linewidth of individual features can be explained in terms of nearest-neighbor Se host lattice isotopes. Finally, features perturbed from the isolated AlZn case are considered as well as the remaining LVM of unknown origin.