Effects of ampoule rotation on vertical zone-melting crystal growth: steady rotation versus accelerated crucible rotation technique (ACRT)
Resource
Journal of Crystal Growth 203 (1-2): 286-296
Journal
Journal of Crystal Growth
Journal Issue
203
Pages
286-296
Date Issued
1999
Date
1999
Author(s)
Lan, C. W.
Chian, J. H.
Abstract
Computer simulation is performed to illustrate the significance of ampoule rotation on the flows, interface shapes, and the growth rate in vertical zone-melting (VZM) crystal growth. For the growth of a 2 cm GaAs crystal in a quartz ampoule, simulation results show that even low-speed ampoule rotation can significantly affect the flows and further the growth interface. The concave growth front due to buoyancy convection can be inverted easily to a convex one by steady ampoule rotation. The accelerated crucible rotation technique (ACRT) also has a similar effect on the growth interface, but less effective. In addition, severe periodic growth and remelting is induced by ACRT, and it is enhanced significantly by natural convection.
Type
journal article
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