Ceramic coated with molten silicon

Details Ceramic coated with molten silicon Ceramic coated with molten silicon

1977-12-19

1979-01-30

Hoffman, James R.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

357 85, 428210, 428408, 428446, B32B 310, B32B 904

Patent

active

041373553

ABSTRACT:
It is desirable to coat large area, thin sheets of large-grain polycrystalline silicon on an inexpensive ceramic substrate for use in solar cell applications and the like. Such ceramic substrate as are used are chosen from those having thermal expansion coefficients similar to those of silicon. The ceramics meeting these requirements, for example mulite, alumina and zirconia, when brought into contact with molten silicon, however, are not wet by the silicon and no coating takes place. In this invention the structure includes an interface layer comprising carbon on the surface of such a substrate to render the surface wettable by molten silicon. With this interface layer the ceramic of the type which is not wet by molten silicon can be successfully coated with silicon.

REFERENCES:
patent: 3137590 (1964-06-01), Coes

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