Patent ID: 6913647
Filing Date: 2005-07-05
Classification: C30B,Y10T

Abstract:
1. A process of producing a single crystal silicon ingot having a seed-cone, and end-cone and a constant diameter portion between the seed-cone and end-cone, the ingot being grown from a silicon melt in accordance with the Czochralski method, the process comprising growing the ingot from the silicon melt such that the ingot comprises a region which is dominated by vacancy-type intrinsic point defects and controlling the temperature of the ingot such that no portion of the ingot cools to a temperature less than a temperature T A at which agglomeration of intrinsic point defects in the ingot occurs during the time the ingot is being grown such that at least the constant diameter portion of the ingot is substantially free of agglomerated intrinsic point defects.