Patent ID: 8632632
Filing Date: 2014-01-21
Classification: B22D,C03B,C30B,F27B,F27D,Y10T

Abstract:
1. A method for crystallization of silicon comprising: arranging silicon in a crucible; melting the silicon contained in the crucible; and subsequently solidifying the molten silicon while stirring the molten silicon in the crucible by means of an electromagnetic stirring device and causing the molten silicon to circulate within the crucible, characterized by the steps of: solidifying the molten silicon at a specified solidification rate; and controlling the stirring by the electromagnetic stirring device in response to the step of solidifying such that the ratio of a speed of the molten silicon circulating within the crucible and the specified solidification rate is above a first threshold value; wherein the stirring of the molten silicon in the crucible by the electromagnetic stirring device is performed in two stages such that a first speed of the molten silicon circulating within the crucible is obtained in a first stage of the two stages and a second speed of the molten silicon circulating within the crucible is obtained in a second stage of the two stages, the first speed of the molten silicon circulating within the crucible being higher than the second speed of the molten silicon circulating within the crucible.