Process for casting silicon blocks of columnar structure

Details Process for casting silicon blocks of columnar structure Process for casting silicon blocks of columnar structure

1991-06-07

1993-10-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Measuring a weight or volume

264327, 264332, C04B 3560

Patent

active

052543005

ABSTRACT:
By means of the process and by means of the apparatus, fused silicon is produced continuously, or in phases, and zonally cast into a mold in which it is caused to solidify zonally. The temperature conditions in the solidification zone are controlled with the aid of a movable heating zone, by means of which the crystallization front is adjusted to the rising level that fills up the mold, this level being in turn controlled by the fusion rate of the silicon. Polycrystalline silicon blocks can be obtained in which, because of the flat shape of the crystallization front, the columnar single-crystal domains within the blocks extend almost vertically and which represent an excellent solar cell base material having high diffusion lengths and lifetimes of the minority charge carriers, from which solar cells of correspondingly high efficiencies can be produced.

REFERENCES:
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patent: 4382838 (1983-05-01), Authier
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patent: 4834382 (1989-05-01), Spector
J. M. Borrego et al., "Non-Destructive Lifetime Measurement in Silicon Was by Microwave Reflection," Solid State Electronics, vol. 30, No. 2, pp. 195-201, 1987.

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