Silica glass crucible equipped with a bubble-free and reduced bubble growth wall

摘要

PROBLEM TO BE SOLVED: To provide a crucible, wherein a volume change is hardly observed in the crucible wall, and the crucible undergoes little influence on the melt level and is especially suited for slow silicon ingot pulling with reduced crystalline defects when used in a Czochralski process.;SOLUTION: The silica glass crucible includes a stable, bubble-free inner layer and an opaque outer layer. Both layers exhibit a reduced bubble growth during the Czochralski process. The fusion process of the invention controls the dynamic gas balance at the fusion front where a formed grain is molten to dense molten silica.;COPYRIGHT: (C)2007,JPO&INPIT