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Purification et caractérisations physico-chimiques et électriques de silicium d'origine métallurgique destiné à la conversion photovoltaïque

Abstract : The feedstock shortening is a major challenge for the photovoltaic industry. Among the possible routes from metallurgical grade to solar grade silicon, the plasma refining to reduce the boron content, combined with segregations to remove the metallic pollutants seems very promising. The plasma process combines electromagnetic stirring of the molten silicon with the boron volatilization by the reactive species produced by the plasma. The boron volatilization has been studied via thermodynamic calculations thanks to the FactSage code, and the chemical on line analysis of the volatilised pollutants in the flue gases of the process by ICP-OES. The electromagnetic stirring has been the subject of a numeric and experimental study. The distribution of reactive species onto the surface has been investigated replacing liquid silicon with a graphite target. The optimized process permitted the production of silicon with reduced boron content. The chemical and electrical characterisations of the refined and crystallised material have showed too high concentrations of aluminium, oxygen and phosphorus. However the life time of minority carriers was comprised between 20 and 50 µs and cells with efficiency above 14% have been produced.
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Submitted on : Thursday, June 18, 2009 - 9:05:14 AM
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Julien Degoulange. Purification et caractérisations physico-chimiques et électriques de silicium d'origine métallurgique destiné à la conversion photovoltaïque. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2008. Français. ⟨tel-00396396⟩

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