Patent ID: 7160386

Claim:
A single crystal semiconductor manufacturing apparatus in which a quartz crucible is accommodated inside a single crystal pulling vessel, a polycrystalline raw material is melted inside the quartz crucible, a single crystal semiconductor is pulled up from the melt inside the quartz crucible, and oxygen concentration in the single crystal semiconductor is controlled during the pulling, characterized in that a plurality of heating means that allow independent adjustment of amount of heating from each of said plurality of heating means applied to the quartz crucible are disposed around a circumference of the quartz crucible along a vertical direction of the quartz crucible, whereby the diameter of the single crystal semiconductor is controlled to a desired size by adjusting an amount of heating of an upper-side heating means by taking a remaining molten amount of the melt as a variable, and by using a predetermined function so that the diameter of the single crystal silicon in the axial direction is maintained at a larger diameter; and oxygen concentration in the single crystal semiconductor is controlled to a desired concentration by adjusting amount of heating of a lower-side heating means so that generation of natural convection is promoted.