Modelling dislocation generation in high pressure Czochralski growth of InP single crystals: part II**Most of the work was performed when SP was at: Department of Mechanical Engineering, Stony Brook University, Stony Brook, NY 11794, USA.

Abstract

The visco-plastic model developed in part I of this work is used here to study the dislocation evolution in high pressure Czochralski growth of InP single crystals. Towards this an in-house computational fluid dynamics code MASTRAPP is 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 is fed to ABAQUS and the visco-plastic constitutive equations are 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 is 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 is found to have the most significant effect on the dislocation densities.