CONTROL OF CRYSTAL-GROWTH IN BRIDGMAN FURNACE

Control of crystal quality during crystal growth requires accurate imp lementation of thermal boundary conditions. We identify this problem a s the furnace temperature control problem. The thermal boundary condit ions, in turn, dictate the interface shape between the solid and the l iquid region of the material. Determination of the boundary conditions for a given desired interface shape is considered as the material tem perature control problem in this paper. We outline the current efforts for the solution of the furnace temperature control and the material temperature control problems. We restrict our review to Bridgman growt h control techniques.