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US Patent 7651768 Reduced wetting string for ribbon crystal

Patent 7651768 was granted and assigned to Evergreen Solar on January, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A string for use in a string ribbon crystal has a base portion with a refractory material, and an externally exposed layer radially outward of the refractory material. The base portion has a coefficient of thermal expansion that is generally matched with the coefficient of thermal expansion for silicon. The externally exposed layer has a contact angle with silicon of between about 15 and 120 degrees.

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