Patent ID: 6858307
Filing Date: 2005-02-22
Classification: A61K,C30B,Y10T

Abstract:
1. A single crystal silicon ingot having a central axis, a seed-cone, an end-cone, and a constant diameter portion between the seed-cone and the end-cone having a lateral surface, a radius, R, extending from the central axis to lateral surface, and an axial length, L, the single crystal silicon ingot, after being grown and cooled from the solidification temperature, having a constant diameter portion comprising multiple axially symmetric regions alternating along the axis of the ingot between a region wherein vacancies are the predominant intrinsic point defect and a region wherein interstitials are the predominant intrinsic point defect, the ingot having at least 2 interstitial dominant regions which are substantially free of agglomerated interstitial defects separated by a vacancy dominant region along the axis of the constant diameter portion of the ingot, wherein the radius of the constant diameter portion of the ingot is at least about 75 mm.