Patent ID: 6908509
Filing Date: 2005-06-21
Classification: C30B,Y10T

Abstract:
1. A CZ raw material supply method for charging a solid raw material in the shapes of granules/lumps into a molten raw material in a crucible in single crystal growth by means of a CZ method, comprising: a step of closing a bottom of a cylindrical raw material vessel made of a material non-meltable when being in contact with said molten raw material in said crucible with a bottom cover made of a material meltable and removable when being in contact with said molten raw material in said crucible to cause said raw material vessel to be filled with said solid raw material in the shapes of granules/lumps; a step of hanging down said raw material vessel, attached with said bottom cover, and filled with said solid raw material above said crucible to melt said bottom cover by putting it into contact with said molten raw material in said crucible and to thereby open a bottom of said raw material vessel; and a step of supplying said solid raw material in said raw material vessel into said molten raw material in said crucible from said opened bottom.