Title: Process for producing large-size, self-supporting plates of silicon

Abstract: Process for producing large-size, self-supporting plates of silicon deposd from the gaseous phase on a substrate body, which comprises heating a graphite substrate to deposition temperature of silicon, which is deposited on the substrate from a gaseous compound to which a dopant has been added until a layer of about 200 to 650 .mu.m has formed, subsequently melting 40-100% of this layer from the free surface downward, resolidifying the molten silicon by adjustment of a temperature gradient from the substrate body upward, and finally separating the silicon therefrom. The plates so formed are used primarily for making solar cells.

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Inventors: Authier, Bernhard (Burghausen, DE, US)
Griesshammer, Rudolf (Burghausen, DE, US)
Koppl, Franz (Altotting, DE, US)
Lang, Winfried (Burghausen, DE, US)
Sirtl, Erhard (Inn, DE, US)
Rath, Heinz-Jorg (Burghausen, DE, US)

Application Number: 743268
Filing Date: 1976-11-19
Publication_date: 1978-12-26
Assignee: Wacker-Chemitronic Gesellschaft fur Elektronik-Grundstoffe mbH (Burghausen, DE)
Primary Class(es): 438/62 117/54, 117/914, 117/915, 117/934, 136/258, 136/261, 264/81, 264/85, 423/348, 423/349, 438/68, 438/490, 438/907
Other Classes:
US Patent Ref:

3063811	Nov, 1962	Kniepkamp et al.	423/349.
3160521	Dec, 1964	Ziegler et al.	427/86.
3160522	Dec, 1964	Heywang et al.	423/349.
3549411	Dec, 1970	Bean et al.	264/81.
3565674	Feb, 1971	Boland et al.	264/81.
3900540	Aug, 1975	Robba et al.	264/81.
3969163	Jul, 1976	Wakefield	427/86.
4027053	May, 1977	Lesk	423/348.

Other Refs:
Primary Examiner: Thurlow, Jeffery R.
Assistant Examiner:
Attorney: Collard; Allison C., Galgano; Thomas M.