A visco-plastic model was used here to study the dislocation evolution during the high-pressure Czochralski growth of InP single crystals. A computational fluid dynamics code (MASTRAPP) was linked to the ABAQUS software. MASTRAPP has the capability to predict the thermal field history in the Czochralski furnace throughout the growth period. The thermal loading history determined through MASTRAPP was fed to ABAQUS and the visco-plastic constitutive equations were integrated while maintaining force equilibrium in the growing crystal. The combined model predicts the final dislocation densities in the crystal at the end of the growth period. It was then used to study and predict the effect of various parameters and phenomena on the final dislocation densities—thermal shock, gas convection, height of boric oxide encapsulant layer, marginal roles of thermal radiation and melt convection, and the cool down period. Gas convection was found to have the most significant effect on the dislocation densities.

Modelling Dislocation Generation in High-Pressure Czochralski Growth of InP Single Crystals – II. S.Pendurti, V.Prasad, H.Zhang: Modelling and Simulation in Materials Science and Engineering, 2005, 13[2], 267-97