Method for producing high purity Si for solar cells

Details Method for producing high purity Si for solar cells Method for producing high purity Si for solar cells

1983-04-20

1984-07-17

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

423349, C01B 3302

Patent

active

044605560

ABSTRACT:
Highly purified starting materials for the production of silicon suitable for fabrication of solar cells are produced via the carbo-thermal reduction process. A carbon-containing material with impurities therein, either by itself or admixed with glass bodies, which are attained from a melt of quartz sand and glass-forming additives formed into a fiber form and pulverized, is converted into a granulate form with the aid of a bonding agent. The resultant granulates are contacted with a hot inorganic acid, such as 3N HCl at about 90.degree. C., to extract substantially all impurities from the granulates, which can be in pellet or tablet form. The resultant purified pellets are then directly charged into an electrical arc furnace to yield solar-quality silicon. With this process, highly purified SiO.sub.2 and highly purified carbon are produced in a simple and cheap manner. The impurity level for boron, phosphorus and transition metal in these starting materials is less than about 10 ppm.

REFERENCES:
patent: 4247528 (1981-01-01), Dosaj et al.
patent: 4294811 (1981-10-01), Aulich et al.

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