The use of magnetic fields in vertical Bridgman/Gradient Freeze-type crystal growth |
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Authors: | Olf Pätzold Kathrin Niemietz Ronny Lantzsch Vladimir Galindo Ilmars Grants Martin Bellmann Gunter Gerbeth |
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Institution: | 11875. Institut für Nichteisenmetallurgie und Reinststoffe, TU Bergakademie, Freiberg, Germany 21875. Hanwha Q.Cells GmbH, Thalheim, Germany 31875. Institut für Fluiddynamik, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany 41875. Sintef Foundation, Norwegian Institute of Technology, Trondheim, Norway
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Abstract: | This paper outlines advanced vertical Bridgman/Gradient Freeze techniques with flow control using magnetic fields developed for the growth of semiconductor crystals. Low-temperature flow modelling, as well as laboratory-scaled crystal growth under the influence of rotating, travelling, and static magnetic fields are presented. Experimental and numerical flow modelling demonstrate the potential of the magnetic fields to establish a well-defined flow for tailoring heat and mass transfer in the melt during growth. The results of the growth experiments are discussed with a focus on the influence of a rotating field on the segregation of dopants, the influence of a travelling field on the temperature field and thermal stresses, and the potential of rotating and static fields for a stabilization of the melt flow. |
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