Patent ID: 9103049
Filing Date: 2015-08-11
Classification: C30B,Y10T

Abstract:
1. A method for reducing gas bubbles in melt formed by initially melting semiconductor wafer raw material using a single crystal manufacturing apparatus that comprises a crucible and a side heater provided so as to surround a side surface of the crucible, the method comprising the following steps to be performed in sequence before manufacturing a single crystal: first, placing raw material into the crucible; second, a side heating step of mainly heating the side surface of the crucible using the side heater for partly melting the raw material in the crucible to form the melt where the raw material is partly melted and some unmelted raw material is still present; third, an adjusting step of adjusting, prior to complete melting of said raw material, a relative position between the crucible and the side heater such that the amount of heat applied to a bottom part of the crucible by the side heater is greater than the amount of heat applied to the side surface of the crucible after the melt where the raw material which is partly melted is formed; and fourth, a bottom heating step of maintaining the adjusted relative position and heating the bottom part of the crucible by the side heater for at least 60 minutes after the state in which the melt where the raw material is partly melted is formed has arrived, reducing the gas bubbles in the melt.