Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from liquid or supercritical state – Havin growth from molten state
Patent
1997-08-28
1999-10-26
Hiteshew, Felisa
Single-crystal, oriented-crystal, and epitaxy growth processes;
Processes of growth from liquid or supercritical state
Havin growth from molten state
117204, 117206, 4222451, C30B 2306
Patent
active
059721073
ABSTRACT:
An apparatus for purifying metallurgical grade silicon to produce solar grade silicon has a container for holding molten silicon and one or more submergible torches for providing a flame surrounded by inert gas to heat the molten silicon so that the reaction time is prolonged, to create turbulence, and to introduce silica powder and water vapor for reactions with molten silicon. The molten silicon is then directionally solidified by providing the container in a coolant tank and controlling the coolant level with controllable valves so that further purification is achieved by segregating impurities.
REFERENCES:
patent: 4456480 (1984-06-01), Wintenberger
patent: 4684513 (1987-08-01), Iya
patent: 4747906 (1988-05-01), Shingu et al.
patent: 4818495 (1989-04-01), Iya
patent: 4837376 (1989-06-01), Schwirtlich et al.
patent: 4900532 (1990-02-01), Kurz et al.
patent: 5182091 (1993-01-01), Yuge et al.
patent: 5208001 (1993-05-01), Truitt et al.
Baba, H. et al., 13th European Photovoltaic Solar Energy Conference Oct. 23-27, 1995, Nice, France, Metallurgical Purification for Production of Solar Grade Silicon from Metallic Grade Silicon, pp. 390-394.
Khattak, C. P. et al., The Electromechamical Society, Inc., Fall Meeting, Denver, Colorado, Oct. 11-16, 1981, Refinement of MG Silicon by HEM for Photovoltaic Applications, pp. 1137-1138.
Khattak Chandra P.
Schmid Frederick
Crystal Systems Inc.
Hiteshew Felisa
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