Patent ID: 8696813
Filing Date: 2014-04-15
Classification: C30B,Y10T

Abstract:
1. A method of manufacturing a silicon single crystal comprising: detecting touching status of a seed crystal at silicon melt by supplying a first voltage using a vitreous silica crucible side as a negative electrode and a pulling shaft side as a positive electrode and by monitoring change of the first voltage, when the seed crystal provided at a front end of the pulling shaft touches the silicon melt inside a vitreous silica crucible; devitrifying an inner surface of the vitreous silica crucible as supplying a second voltage greater than the first voltage using the vitreous silica crucible side as a positive electrode and the pulling shaft side as a negative electrode during a temperature control period of the silicon melt, the temperature control period being a certain period after the touch of the seed crystal at the silicon melt; and growing a silicon single crystal by slowly pulling the seed crystal as supplying a third voltage smaller in absolute value than the second voltage using the vitreous silica crucible side as a negative electrode and the pulling shaft side as a positive electrode after the temperature control period.