Patent ID: 8211228

Claim:
A method for producing a single crystal that is a multi-pulling method for pulling a plurality of single crystals from a raw material melt in a same crucible in a chamber by a Czochralski method, comprising steps of: pulling a single crystal from a raw material melt; then additionally charging polycrystalline raw material in a residual raw material melt without turning off power of a heater, and melting the polycrystalline raw material; then pulling a next single crystal; and repeating the steps and thereby pulling the plurality of single crystals; wherein in a case of setting a ratio of a pulling rate V and crystal temperature gradient G near a solid-liquid interface along a pulling axis direction when a straight body of the single crystal is grown to be V/G, in order to control the V/G of each of the single crystals to be pulled to a predetermined value, any one or more of pulling conditions of at least, the pulling rate V, flow amount of an inert gas introduced into the chamber, pressure in the chamber, and distance between a melt surface of the raw material melt and a heat-shielding member disposed oppositely to the raw material melt surface in the chamber, is preliminarily modified according to an elapsed time from beginning of operation, before initiating pulling each next single crystal but after pulling of an immediately preceding crystal; and thereby the single crystal having a desired defect region is grown.