Phosphorous removal in silicon purification

Details Phosphorous removal in silicon purification Phosphorous removal in silicon purification

1980-09-09

1982-01-26

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

23295R, 23296, 156DIG64, B01D 900, C01B 3302

Patent

active

043128491

ABSTRACT:
A method of removing phosphorous impurity in a process for purifying silicon wherein silicon is crystallized from a solvent metal is disclosed. The method comprises the steps of providing a molten body containing silicon, the remainder aluminum and impurities, and treating the body with a source of chlorine to remove phosphorous therefrom.

REFERENCES:
patent: 2471899 (1949-05-01), Regner
patent: 2651922 (1953-09-01), Graham
patent: 2866701 (1958-12-01), Strauss
patent: 3008887 (1961-11-01), Herglotz
patent: 3069240 (1962-12-01), Armand
patent: 3871872 (1975-03-01), Downing et al.
patent: 3933981 (1976-01-01), Wakefield et al.
patent: 4256717 (1981-03-01), Dawless
Litz et al., "Crystallization of Pure Silicon from Molten Aluminum", presented at the Second Joint AICheE Meeting, May 19-22, 1968, Preprint 37B.

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