Patent ID: 6364947
Filing Date: 2002-04-02
Classification: C30B,Y10S,Y10T

Abstract:
An apparatus for manufacturing a silicon single crystal according to a Czochralski method, wherein a solid-liquid interface heat insulator is arranged above a silicon melt so as to enclose a silicon single crystal and form a gap of 3-5 cm between the surface of the melt and the bottom end of the solid-liquid interface heat insulator during the growth of a silicon single crystal, so that a furnace temperature is established such that a temperature gradient difference &Dgr;G (=Geâˆ’Gc) is not greater than 5Â° C./cm, where Ge is a temperature gradient (Â° C./cm) at a peripheral portion of the crystal, and Gc is a temperature gradient (Â° C./cm) at a central portion of the crystal, both in an in-crystal descending temperature zone between 1420Â° C. and 1350Â° C. or between a melting point of silicon and 1400Â° C. in the vicinity of the solid-liquid interface of the crystal.