Process for producing refined metallurgical silicon ribbon

Details Process for producing refined metallurgical silicon ribbon Process for producing refined metallurgical silicon ribbon

1977-11-21

1980-03-18

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

23301, 156608, 156DIG64, 156DIG88, C01B 3302

Patent

active

041939743

ABSTRACT:
Silicon platelets essentially free of iron are precipitated from a solution of metallurgical grade silicon in molten aluminum and are melted in contact with silica slag to produce a refined metallurgical silicon. The silicon-slag melt solidified in a unidirectional manner so as to directionally solidify said silicon. A directionally solidified refined metallurgical silicon (DS/RMS) ribbon is pulled from a melt of the thus-refined silicon. This DS/RMS ribbon is a low-cost product having a substantially higher impurity content level than in conventional high purity semiconductor grade silicon while, at the same time, being useful for solar cell applications.

REFERENCES:
patent: 1180968 (1916-04-01), Brockbank
patent: 2749216 (1956-06-01), Dinwiddie et al.
patent: 3012865 (1961-12-01), Pellin
patent: 3097068 (1963-07-01), Litz et al.
patent: 3871872 (1975-03-01), Downing et al.
Ravi et al., "Comples International Meeting on Heliotechnique and Development," Dhahran, Saudi Arabia, Mar., 1976, pp. 1-5, 8.

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