Correlation between ZnSe crystal growth conditions from melt and generation of large-angle grain boundaries and twins

A series of ZnSe crystals for fundamental studies were grown by the vertical Bridgman method under 30 atm inert gas antipressure. A critical relationship between growth velocity and axial temperature gradient for the maintenance of a morphologically stable interface of 1.5×10 -2 cm 2 h -1 K -1 was determined. Furthermore, it has been shown that the number of twins is inversely proportional to the number of large-angle grain boundaries. Finally, the tendency of increasing improvement of the crystal quality with increasing superheating of the melt before the growth run was observed.