Patent ID: 7083677
Filing Date: 2006-08-01
Classification: C30B

Abstract:
1. A method for manufacturing a silicon single crystal by single crystal pulling-up with a Czochralski method, comprising steps of: using a seed crystal comprising a silicon single crystal without including a vacancy excess region; growing a neck comprising a silicon single crystal without including a vacancy excess region with a diameter contracted smaller than, or equal to that of the contact surface of the silicon seed crystal in contact with a raw material silicon melt; performing necking so that the length L of the neck satisfies L≧d·(cot ψ), where d denotes the length of the diameter or the diagonal of the contact surface of the silicon seed crystal in contact with the raw material silicon melt, and ψ denotes the angle formed between the propagation direction of dislocations and the growth direction of the neck, and growing the silicon single crystal with the diameter expanded.