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Removing Chlorides From Metallurgical-Grade SiliconProcess for making low-cost silicon for solar cells is further improved. Silane product recycled to feed stripper column converts some of heavy impurities to volatile ones that pass off at top of column with light wastes. Impurities--chlorides of arsenic, phosphorus, and boron-would otherwise be carried to subsequent distillations where they would be difficult to remove. Since only a small amount of silane is recycled, silicon production efficiency remains high.
Document ID
19820000027
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Breneman, W. C.
(Union Carbide Corp.)
Coleman, L. M.
(Union Carbide Corp.)
Date Acquired
August 10, 2013
Publication Date
December 1, 1982
Publication Information
Publication: NASA Tech Briefs
Volume: 6
Issue: 4
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
NPO-15218
Accession Number
82B10027
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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