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Past Work
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Past Work:  Contiguous Capillary Coating to Form Silicon Sheets
This multicrystalline Si ribbon growth process was originated in the late 1970's1,2.  In this method, a porous or grid-like sheet of carbon is passed through a Si melt to form a crystalline-Si coating that is contiguous from the rear surface to the front surface.  Because the substrate carries the liquid coating along with it, very high speeds can be attained, with solidification taking place some distance out of the melt reservoir where thermal profiles for heat removal can be tailored.  An example of a reticulated vitreous carbon substrate and a machined graphite substrate are shown below, along with a Si-coated substrate. This technique was later developed further at Seimens AEG in Munich, Germany, and retitled the s-web method.

CCCSUBST.jpg (20251 bytes)

CCCSIRIB.jpg (20605 bytes)

1. T.F. Ciszek and G.H. Schwuttke, "Inexpensive Silicon Sheets for Solar Cells," NASA Tech. Briefs, Winter (1977) 432.
2. T.F. Ciszek and J.L. Hurd, "Contiguous Capillary Coating of Silicon on Porous Carbon   Substrates," in: l4th IEEE Photovoltaic Specialist Conf. Record, San Diego, Calif. Jan. 7-l0, 1980, IEEE, New York, l980, pp. 397-399).


♦♦♦♦♦          ted_ciszek @ siliconsultant.com (remove spaces)             ♦♦♦♦♦