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Numerical and experimental studies of magnetic field effects on solidification of metallurgical silicon for photovoltaic applications

Abstract : The photovoltaic modules are generally produced using silicon wafers. Theirelectrical efficiency is related to the crystal quality, which is influenced bythe presence of pollutants in the ingots from which the wafers are cut. Siliconingots are obtained as a result of solidification processes, which implygrowing a crystal from melt. During this solidification process, impurities areseparated from the silicon. The segregation process is greatly influenced bythe melt velocity during the solidification process. The control of the meltflow during the crystallization process can be achieved using external magneticfields. This thesis presents the results of the study on the influence ofthe forced convection induced by a travelling magnetic field (TMF) duringthe solidification process, using both an experimental set-up (VB2) and anumerical model.
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Submitted on : Thursday, September 24, 2015 - 3:10:20 PM
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Mircea Cablea. Numerical and experimental studies of magnetic field effects on solidification of metallurgical silicon for photovoltaic applications. Materials. Université Grenoble Alpes, 2015. English. ⟨NNT : 2015GREAI017⟩. ⟨tel-01204763⟩

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