Morphology, twinning, and photoluminescence of ZnTe crystals grown by chemical synthesis from vapor-phase components

The features of the growth process, defect structure, and photoluminescence of ZnTe crystallites obtained on the crystallizer walls at 650°C, under the conditions of rapid deposition, from supersaturated source-component vapors are studied. It is found that each separate crystallite, whose size can be as large as 10 mm, has a common [011] axis around which several individuals are twinned. Perfect fragments of separate individuals are packed in a single system of plane (110) macrolayers, each reaching a thickness of several tens of micrometers. A 0.8-mm-thick single-crystal platelet that has (110) growth layers on one side is crossed by a system of (1 11) twin boundaries perpendicular to the growth surface, with the number of boundaries decreasing at the outer growth surface. The photoluminescence spectra confirm the structural perfection of the obtained crystals.