US Patent:
20110220012, Sep 15, 2011
Inventors:
Zhenming Wu - Nashua NH, US
Dean C. Skelton - Fitzwilliam NH, US
Brett C. Forlano - Manchester NH, US
Assignee:
GT SOLAR, INCORPORATED - Merrimack NH
International Classification:
C30B 11/02
C01B 33/021
C30B 35/00
US Classification:
117 81, 117223, 425470, 264332, 264327
Abstract:
A crystal growth apparatus includes a crucible arranged on a support mechanism, and at least two plates formed below the support mechanism and movable in a coordinated manner to form a symmetrical aperture centered with respect to an ingot being formed in the crucible, and a drive mechanism for driving the plates with one degree of freedom. The plates open in a plurality of discrete positions to form an aperture that is load centered with respect to the ingot being formed, in order to promote directional solidification of the ingot being formed, and thus achieve a desired convex profile of the ingot.