Patent ID: 8173094
Filing Date: 2012-05-08
Classification: C01B,H01L,Y02E,Y02P

Abstract:
1. A method for producing polycrystalline silicon comprising the steps of (A), (B), and (C), (A) reducing a chlorosilane represented by the formula (1) with aluminum at a temperature T  wherein n is an integer of 0 to 3, (B) transferring the silicon compound and the chloride of the aluminum to a zone having a temperature T (C) depositing polycrystalline silicon in the zone having a temperature T wherein the temperature T 1 is not less than 1.41 times and is less than 2.33 times of a melting point expressed in Kelvin of aluminum, and the temperature T 2 is not less than 1.5 times of a sublimation point or boiling point expressed in Kelvin of the chloride of aluminum.