Patent ID: 7208042

Claim:
A method of manufacturing a silicon single crystal, comprising rotating a quartz crucible ( 13 ) for storing a silicon melt ( 12 ) at a rotation speed, rotating a silicon single crystal ingot ( 25 ) pulled from the silicon melt ( 12 ) in an opposite direction to the rotation of the quartz crucible ( 13 ) at a rotation speed, and pulling the silicon single crystal ingot ( 25 ) at a pull rate such that an interior of the silicon single crystal ingot ( 25 ) becomes a perfect region in which agglomerates of interstitial silicon point defects and agglomerates of vacancy point defects are absent: wherein an average rotation speed CR TAV of the quartz crucible ( 13 ) during the pulling of a top ingot portion ( 25 a ) of the silicon single crystal ingot ( 25 ) is set faster than an average rotation speed CR BAV of the quartz crucible ( 13 ) during the pulling of a bottom ingot portion ( 25 b ) of the silicon single crystal ingot ( 25 ).