METHOD FOR PURIFYING SILICON

METHOD FOR PURIFYING SILICON

The present invention relates to a method for purifying silicon, comprising at least the following steps: c) providing a container (1) that comprises silicon (10) in molten state, the container (1) having a longitudinal axis (X) and the silicon (10) in molten state defining a free surface (11) on th...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: AUDOIN, Claire, CHAVRIER, Denis, ALBARIC, Mickaël, PIHAN, Etienne, GARANDET, Jean-Paul
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE
APPARATUS THEREFOR
CHEMISTRY
COMPOUNDS THEREOF
CRYSTAL GROWTH
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE
REFINING BY ZONE-MELTING OF MATERIAL
SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE
SINGLE-CRYSTAL-GROWTH
UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:The present invention relates to a method for purifying silicon, comprising at least the following steps: c) providing a container (1) that comprises silicon (10) in molten state, the container (1) having a longitudinal axis (X) and the silicon (10) in molten state defining a free surface (11) on the side opposite the bottom (4) of the container (1); d) imposing on the silicon (10) in molten state conditions that are favourable for the solidification thereof, the mean temporal velocity for the duration of step b) of propagating the solidification front (13) of the silicon, measured along the longitudinal axis (X) of the container (1), being no lower than 5 μm/s, preferably 10 μm/s; said method being characterised in that at least one stirring system (30) imposes, during all or part of step b), a flow of silicon (10) in molten state with a Reynolds number comprised between 3 104 and 3 106, preferably between 105 and 106.