Effect of steady crucible rotation on segregation in high-pressure vertical Bridgman growth of cadmium zinc telluride

Three-dimensional axisymmetric, time-dependent simulations of the high-pres sure vertical Bridgman growth of large-diameter cadmium zinc telluride are performed to study the effect of steady crucible rotation on axial and radi al segregation in the grown crystal. The model includes details of heat tra nsfer, melt convection, solid-liquid interface shape, and pseudo-binary zin c segregation. Imposing a moderate rotation rate of 10 rpm on the system sl ightly improves axial segregation but makes radial segregation much worse. Moreover, values of dimensionless thermal Rossby and Taylor numbers calcula ted for this system indicate that the baroclinic instability may occur at t he rotation rates studied. (C) 1999 Elsevier Science B.V. All rights reserv ed.