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US 4,786,479 AGranted
Apparatus for dendritic web growth systems
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsRolv Hundal, Raymond G. Seidensticker, James P. McHugh
Life of this patent
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Abstract
A method and apparatus for growing dendritic web crystals at increased growth rates is disclosed in which a sublid is used to maintain a sufficiently hot silicon melt surface temperature to insure stable web growth, while simultaneously permitting more efficient heat transfer from the growing dendritic web to the cooler susceptor lid.
Claims17
An apparatus for growing dendritic web crystals comprising:
- a. a susceptor;
- b. a crucible for melting silicon, said crucible nesting within said susceptor;
- c. a sublid positioned above said susceptor and crucible, said sublid having upper and lower horizontal surfaces, said sublid further having a slot through which a dendritic web crystal may be pulled, said slot defining at least one inner surface in said sublid;
- d. a susceptor lid having an upper horizontal surface and a lower horizontal surface, said susceptor lid further having a slot through which a dendritic web crystal may be pulled, said susceptor lid further having a lip disposed downwardly from said susceptor lid lower horizontal surface, said lip extending continuously and peripherally around said susceptor lid slot and having an outer surface facing the inner surface of said sublid, said susceptor lid lower horizontal surface facing said sublid upper horizontal surface;
- e. said susceptor lid being positioned above said sublid such that the lip of said susceptor lid fits substantially concentrically within said sublid slot, and providing insulating space between the upper horizontal surface of said sublid and the lower horizontal surface of said susceptor lid and between the outer surface of said susceptor lid lip and the inner surface of said sublid.
2 more elements
Dependencies are inferred from the claim text.