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Optimization of control parameters of cadmium zinc telluride Bridgman single crystal growth
Author(s) -
Juncheng Liu,
Dejie Song,
Hongying Zhang,
Shenqiu Zhai
Publication year - 2007
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200710901
Subject(s) - crucible (geodemography) , micro pulling down , temperature gradient , crystal (programming language) , crystal growth , zinc , cadmium zinc telluride , convection , chemistry , single crystal , cadmium telluride photovoltaics , materials science , heat transfer , directional solidification , analytical chemistry (journal) , crystallography , thermodynamics , optics , metallurgy , chromatography , nanotechnology , physics , computational chemistry , microstructure , quantum mechanics , detector , computer science , programming language
The temperature gradient within a furnace chamber and the crucible pull rate are the key control parameters for cadmium zinc telluride Bridgman single crystal growth. Their effects on the heat and mass transfer in front of the solid‐liquid interface and the solute segregation in the grown crystal were investigated with numerical modeling. With an increase of the temperature gradient, the convection intensity in the melt in front of the solid‐liquid interface increases almost proportionally to the temperature gradient. The interface concavity decreases rapidly at faster crucible pull rates, while it increases at slow pull rates. Moreover, the solute concentration gradient in the melt in front of the solid‐liquid interface decreases significantly, as does the radial solute segregation in the grown crystal. In general, a decrease of the pull rate leads to a strong decrease of the concavity of the solid‐liquid interface and of the radial solute segregation in the grown crystal, while the axial solute segregation in the grown crystal increases slightly. A combination of a low crucible pull rate with a medium temperature gradient within the furnace chamber will make the radial solute segregation of the grown crystal vanish. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)