Numerical simulation of the modified two-temperature horizontal bridgman growth of gallium arsenide crystals inside a quartz boat

A three-dimensional simulation of the modified two-temperature horizontal Bridgman growth of gallium arsenide crystals has been developed. The computer model solves time-dependent, Navier-Stokes equations with a Boussinesq approximation by the finite difference method. A new model of nodal latent heat is adopted for melting and freezing processes. The interface of solid-liquid phases as well as flow and temperature fields of both phases are obtained. The simulation finds that the furnace pulling rate and the heat-loss prevention arrangement has an impact on the shape of the interface. The computed solidification fronts agree with the experimental data successfully. The radiation heat loss in the process plays a major role in the heat-transfer mechanism, which has been taken into consideration to obtain the correct trend for the simulation.