Local and global simulations of bridgman and czochralski crystal growth

摘要

A multizone adaptive grid generation-based computer model, MASTRAPP (multizone adaptive scheme for trans-port and phase-change processes) has been used for global simulation of Bridgman and Czochralski (Cz) crystal growth processes. Some new features have been devised and added to the original formulation (Zhang and Prasad, 1995) to make is suitable for global modeling. Dynamic simulations have been performed for Bridgman growth of Bismuth and Cz growth of GaAs. This is the first time that a global LEC model is able to account for the convective flows and heat transfer in both the melt and the gas phases, and predict the shape and location of the solidification interface in a high pressure furnace. Simulations for a Bridgman configuration demonstrate that the interface position and flow pattern strongly depend on the crystal and ampoule materials, thermal boundary conditions, and shape of the furnace.