LOW PRESSURE DEVICE FOR MELTING AND PURIFYING SILICON AND MELTING/PURIFYING/SOLIDIFYING METHOD
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United States of America Patent
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Issued Date -
Jul 12, 2012
app pub date -
Sep 10, 2010
filing date -
Sep 15, 2009
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Abandoned
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Abstract
The device for melting and purifying of a silicon feedstock comprises a crucible arranged inside a sealed chamber. A thermal gradient can be applied to the crucible by an arranged heat exchanger and a heating device. The device likewise comprises a device for reducing the pressure inside the chamber to a value lower than 10−2 mbar and a device for stirring the silicon in the crucible. The silicon feedstock successively undergoes degassing and pre-heating to atmospheric temperature, and then melting and low pressure, high temperature purification. Once the low-pressure purification step has been completed, directed crystallization is carried out.
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