CdSSe ternary alloy films were grown on GaAs(111) by hot-wall beam epi
taxy. The hexagonal crystal phase is obtained. The composition varies
from 0 to 40% selenium. Luminescence spectroscopy at low temperatures
shows a dominant effect by alloy disorder. Localization of carriers, f
or example, is still observed at a pulsed optical excitation density o
f 6 mJ/cm(2). The overall quality of the CdSSe films is sufficient to
use them as buffer layers for the growth of hexagonal superlattices.