Method for producing silicon for use in solar cells

Details Method for producing silicon for use in solar cells Method for producing silicon for use in solar cells

C - Chemistry, Metallurgy

01

B

C01B 33/037 (2006.01) C30B 11/00 (2006.01) C30B 13/00 (2006.01) C30B 15/00 (2006.01)

Patent

CA 2232777

Method for producing highly purified silicon for use in solar cells by a single solidification purification, poring silicon into a mold and gradually fractionally solidifying it while regarding solidification of the liquid surface followed by purifying the solidified silicon by zone melting or applying continuous casting using an electromagnetic mold, or by zone melting in combination with continuous casting, and optionally causing directional solidification to concentrate impurities, leaching and recycling.

Méthode pour la production de silicium de haute pureté destiné à la fabrication de piles photovoltaïques purifié par solidification unique; le silicium est versé dans un moule et graduellement solidifié par fractions en relation avec la solidification de la surface liquide; le silicium à l'état solide est ensuite purifié par fusion zonale ou par coulée continue à l'aide d'un moule électromagnétique, ou encore par fusion zonale combinée à la coulée continue suivie, optionnellement, d'une opération de solidification dirigée, de lessivage et de recyclage.

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