ANALYSIS OF INTERRUPTED GROWTH STRATEGIES FOR CADMIUM TELLURIDE IN ANUNSEEDED VERTICAL BRIDGMAN SYSTEM

A transient, non-dilute finite element model is employed to study a no vel, interrupted growth strategy which has been employed for the unsee ded, vertical Bridgman growth of cadmium telluride. Computations clear ly show the time-dependent translation strategy causes solute diffusio n layers in the melt to successively grow and die in time, thus provid ing a means to mix the cadmium rejected at the growth interface into t he bulk. This strategy stabilizes the solid-liquid interface by delayi ng the onset of constitutional supercooling, thus allowing the use of growth rates for grain selection which are higher than would be possib le using continuous translation.