Patent ID: 6506251
Filing Date: 2003-01-14
Classification: C30B

Abstract:
A method for producing a silicon single crystal by the Czochralski method, in which a seed crystal having a shape of a pointed tip end or a truncated pointed tip end as a shape of its tip end portion to be brought into contact with a silicon melt is used, the tip end of the seed crystal is first carefully brought into contact with the silicon melt, then the seed crystal is descended at a low speed or a surface of the silicon melt is ascended at a low speed to melt the tip end portion of the seed crystal to a first diameter, and subsequently the seed crystal is slowly ascended or the surface of the silicon melt is slowly descended to grow a silicon single crystal ingot without performing necking, wherein after the tip end of the seed crystal is carefully brought into contact with the silicon melt, the seed crystal is maintained at that state for 5 minutes or more to reserve heat in the seed crystal.