The influence of vibrations on melt flows during detached Bridgman crystal growth

摘要

The paper deals with the numerical investigation of melt flows during germanium crystal growth by the Bridgman method under high frequency vibrations of the crystal. According to the experimental setup the mathematical model takes into account the crystal detachment from the crucible walls and the existence of technological channel in the crucible. The modeling is based on the average approach. The study has shown that the crystal vibrations can substantially affect the melt flows. Near the resonance frequencies or when the vibration amplitude is high, a strong average flow generated in the technological channel could reach the crystal-melt interface. Thus, varying the vibration parameters we can change the intensity and localization of the melt flows which should affect the interface shape and the detachment stability and therefore the grown crystal properties.