Optimisation of the VGF growth process by inverse modelling

Numerical and experimental results on the thermal optimisation of vertical gradient freeze crystal growth are presented. An inverse modelling approach is described aimed at solidification with a constant growth rate and planar solid–liquid interface. As a result of modelling an optimised growth proc...

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Bibliographic Details
Published in:Journal of crystal growth 2010-07, Vol.312 (15), p.2175-2178
Main Authors: Bellmann, M.P., Pätzold, O., Stelter, M., Möller, H.J.
Format: Article
Language:English
Subjects:
A1. Inverse problem
A1. Numerical simulation
A1. Optimization
A2. Vertical gradient freeze technique
Ampoules
B2. Semiconducting germanium
Cross-disciplinary physics: materials science
rheology
Crystal growth
Crystals
Exact sciences and technology
Growth from melts
zone melting and refining
Inverse
Materials science
Methods of crystal growth
physics of crystal growth
Modelling
Optimization
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Solidification
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
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Summary:Numerical and experimental results on the thermal optimisation of vertical gradient freeze crystal growth are presented. An inverse modelling approach is described aimed at solidification with a constant growth rate and planar solid–liquid interface. As a result of modelling an optimised growth process characterised by a modified ampoule configuration and thermal regime was established. For experimental confirmation Ga-doped germanium single crystals were grown with the optimised process. In good agreement with the numerical results, solidification with an almost constant growth rate was achieved with the interface deflection being significantly lower than in conventionally grown crystals.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2010.04.036