Patent ID: 6755910
Filing Date: 2004-06-29
Classification: C30B,Y10T

Abstract:
A method for pulling up a single crystal, using an apparatus comprising a crucible for storing a molten material for a single crystal; a heater for heating the molten material; means for pulling up the single crystal to grow after bringing a seed crystal in contact with a surface of the molten material in the crucible; and a flow-regulating member surrounding the single crystal at the growth area for shielding the heat of radiation and for regulating an inert gas flow, wherein the method comprises the following steps of: setting the distance between the lower end of said flow-regulating member and the surface of the molten material to be a first distance D1 when the seed crystal comes into contact with the surface of the molten material in said crucible; forming the single crystal at the neck portion; thereafter setting the distance between the lower end of said flow-regulating member and the surface of said molten material to be a second distance D2 where D1(mm)>D2(mm); and forming the single crystal at the shoulder portion and subsequently forming the single crystal at the body portion.