Patent ID: 6080238
Filing Date: 2000-06-27
Classification: C30B,Y10T

Abstract:
A method of pulling up a single crystal from a molten liquid of raw material in a crucible of an apparatus having plural heaters without a solid layer of raw material in the crucible, the molten liquid having a surface height maintained in a heating region of a topmost heater of the plural heaters relative to the crucible in an up-and-down direction comprising the step of:setting an output ratio of an output of the topmost heater relative to outputs of all the plural heaters when the crystal is being pulled to a value equal to or greater than a value resulting from a product of multiplying a height ratio of a height of the topmost heater in the up-and-down direction relative to a height of the crucible in the up-and-down direction by 0.88 to obtain a required oxygen concentration of the pulled single crystal.