Patent ID: 11885038
Assignee: SUMCO CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 5:
6. The pull-up device of the monocrystalline silicon according to claim 2, further comprising:
a storage configured to store a relationship between the direction of the convection flow and an oxygen concentration of the monocrystalline silicon; and
an oxygen concentration estimation portion configured to estimate an oxygen concentration in a straight body of the pulled up monocrystalline silicon on a basis of the direction of the convection flow estimated by the convection pattern estimation portion and the relationship stored in the storage, wherein
the pull-up controller adjusts at least one of a flow rate of inert gas flowing in a chamber, an internal pressure of the chamber and a rotation speed of the quartz crucible on a basis of the oxygen concentration estimated by the oxygen concentration estimation portion while the intensity of the horizontal magnetic field is kept at 0.2 tesla or more, and pulls up the monocrystalline silicon.