Interfacial Phenomena During Crystal Growth:
Solute Redistribution, Double-diffusive
Convection And Non-isothermal Phase-change
Author(s)
W.-Q. Lu, K. Shi & J. Liu
Abstract
A simplified mathematical physical model with axisymmetric dual reciprocity
boundary element method (ADRBEM) and finite element method (FEM) is used
to numerically simulate the interfacial phenomena during crystal growth: the
solute segregation, redistribution and non-isothermal phase change on the
interface between crystal and thawing fluid, and the double-diffusive convection
driven by the solute gradient and thermal gradient. Some interesting flow
physical phenomena are found.
Keywords: solute redistribution, non-isothermal phase change, double-diffusive
convection.
1 Introduction
The vertical Bridgman process in a circular ampoule has been used widely for
growing the high quality II–IV semiconductor family such as HgCdTe, HgZnTe
and CdZnTe, etc. Solute segregation, diffusion and redistribution will occur at
the phase interface during the crystal growth, so a solutal gradient is generated.
Hence, the double-diffusive convection is driven by the solute gradient together
with the thermal gradient in the fluid phase. Simultaneously, the variation of
solute concentration on the phase-change interface produces non-isothermal
phase-change characters. The growth quality of the crystal is largely controlled
by these interfacial phenomena. However, the devoid of literature is detailed
numerical simulation works for some basic problems, such as the factors to
affect the region of solute redistribution, the non-isothermal phase change and
double-diffusion convection phenomena. The main objective of this paper is to
Keywords
solute redistribution, non-isothermal phase change, double-diffusive
convection.
Related Book
Other papers in this volume
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