Processing of fine silicon powder to produce bulk silicon

Details Processing of fine silicon powder to produce bulk silicon Processing of fine silicon powder to produce bulk silicon

2011-04-19

2011-04-19

Langel, Wayne (Department: 1736)

Chemistry: physical processes

Physical processes

Crystallization

C423S349000

Reexamination Certificate

active

07927385

ABSTRACT:
A method for using substantial quantities of silicon powders as charge and processing it to produce a high quality silicon ingots suitable for photovoltaic use is disclosed. In a fused silica crucible, silicon feedstock containing more than about 5% by weight silicon powder is charged. The crucible with the charged silicon feedstock is placed into a furnace chamber and a vacuum is drawn to remove air. The vacuum is applied slowly. Then, the furnace chamber is backfilled with argon gas and heated to form molten silicon. Afterward, the molten silicon is solidified and annealed to form a multicrystalline silicon ingot.

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