Silica glass crucible with barium-doped inner wall
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United States of America Patent
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Sep 23, 2008
Grant Date -
Mar 8, 2007
app pub date -
Sep 28, 2006
filing date -
Sep 8, 2005
priority date (Note) -
Expired
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Abstract
A silica glass crucible includes a thin barium-doped inner layer, a stable, bubble-free intermediate layer, and a stable opaque outer layer. The fusion process of the present invention controls the dynamic gas balance at the fusion front where formed grain is melted to dense fused silica. The crucible demonstrates reduced bubble growth during a Czochralski process. As a result of the thin barium-doped layer and the reduced bubble growth, the inner surface of the crucible is uniformly minimally textured during a CZ process. The present crucible is especially suited for intense CZ processes for manufacturing silicon ingots used for solar cells or with silicon that is heavily doped with antimony, boron, or arsenic.
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