Atlantic Richfield Company

Samuel N Rea

David L Bender

G Felix Wakefield

Apparatus for production of semiconductor ribbon materials of the type in which molten material is brought into contact with the surface of a rotating cool wheel or drum wherein the cooling surface of the drum is textured to form a plurality of discrete contacting points to enhance growth of large crystal grains.

Textured silicon ribbon growth wheel

Apparatus and method for producing semiconductor ribbon directly from the molten state by contact with a moving chill surface wherein water vapor is introduced to improve ribbon top surface smoothness.

Surface improvement of semiconductors in high speed casting

Apparatus and method for producing semiconductor ribbon directly from the molten state by contact with a moving chill surface wherein the chill surface has longitudinal grooves near its outer edges to define ribbon width and improve smoothness of ribbon edges.

Silicon ribbon growth wheel with edge defining grooves

A silicon ribbon growth wheel having a thermal resistance zone between an outer silicon contacting surface and an inner cooling fluid contacting surface to control rate of heat flow from the outer to inner surfaces. In a preferred form the thermal resistance zone is defined by a row of holes through the wheel near the outer surface with said holes isolated from the cooling fluid. A method for controlling the heat flow is also diclosed.

Silicon ribbon growth wheel and method for heat flow control therein

A silicon ribbon growth wheel having an internal cooling fluid contacting surface modified to provide a lateral temperature profile on the wheel surface of lower temperature near the wheel edges. In a preferred form the inner surface is provided with grooves near the wheel edges to increase heat conduction to the cooling fluid at the wheel edges. A method for surface temperature profiling the growth wheel is also disclosed. A method for surface temperature profiling the growth wheel is also disclosed.

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Thousand Oaks, CA, United States of America

Samuel N Rea