Process and apparatus for the semicontinuous production of silic

Details Process and apparatus for the semicontinuous production of silic Process and apparatus for the semicontinuous production of silic

1978-07-17

1979-11-27

Baldwin, Robert D.

Metal founding

Process

Shaping liquid metal against a forming surface

164322, 164127, 164 61, 164 66, 164130, 164253, 164335, B22D 1500, B22D 2506, B22C 920

Patent

active

041756100

ABSTRACT:
The invention relates to a process and apparatus for manufacturing silicon astings or moldings, having a columnar structure of single-crystal regions of crystal with a preferential crystallographic orientation, and which can be manufactured cheaply and in large numbers in a semi-continuous mode of production. Liquid silicon is cast in a casting station, under an inert gas and preferably under reduced pressure, preferably in graphite molds which are exposed to a temperature gradient of 200.degree. to 1,000.degree. C. After cooling, the silicon is withdrawn automatically via a transport chamber connected to the casting station into special cooling stations, while the casting station is reloaded with an empty mold for repeating the process. The silicon blocks which have preferably been produced by this procedure are use as basic material for inexpensive solar cells having efficiencies of more than 10%, after they have been sawn into individual small wafers and have been doped and lead-bonded.

REFERENCES:
patent: 3601179 (1971-08-01), Taylor
patent: 3677324 (1972-07-01), Higginbotham et al.
patent: 3895672 (1975-07-01), King, Jr. et al.

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