Patent ID: 11905617
Assignee: SILTRONIC AG
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for producing semiconductor wafers of monocrystalline silicon, the method comprising:
pulling a cylindrical section of a single silicon crystal from a melt contained in a crucible, wherein an oxygen concentration in the cylindrical section is not more than 5×1017 atoms/cm3 
subjecting the melt to a horizontal magnetic field;
rotating the crucible at a rotational velocity and in a rotational direction during the pulling of the cylindrical section of the single crystal; and
removing the semiconductor wafers of monocrystalline silicon from the cylindrical section of the single crystal,
wherein an amount of rotational velocity, averaged over time, is less than 1 rpm and the rotational direction is changed continually and the amplitude of the rotational velocity before and after the change in the rotational direction is not less than 0.5 rpm and not more than 3.0 rpm.