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Etude expérimentale et numérique de la précipitation d'impuretés et de la formation des grains dans le silicium photovoltaïque

Abstract : The rapid evolution of photovoltaic silicon cells production induced to use a silicon with a lower purity. This silicon involves silicon carbide and silicon nitride precipitation which lead to new undesirable morphological structure called grits. However physico-chemical parameters which control these phenomenons are still unknown. Thereby, we developed an experimental levitation set-up under ultra high vacuum which allows measuring nucleation undercooling of silicon containing known concentration of carbon and nitrogen. The results showed a rapid decrease of the undercooling whith increasing impurities concentration. In parallel a facetted to equiaxed facetted transition model has been developed. Using analytical theoretical models, it allows predicting the columnar facetted to equiaxed facetted transition all along the ingot solidification and the grain size distribution.
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Contributor : Mickael Beaudhuin <>
Submitted on : Wednesday, February 24, 2010 - 12:00:48 PM
Last modification on : Thursday, November 19, 2020 - 3:54:17 PM
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Mickael Beaudhuin. Etude expérimentale et numérique de la précipitation d'impuretés et de la formation des grains dans le silicium photovoltaïque. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2009. Français. ⟨tel-00459549⟩

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