Patent ID: 6846539

Claim:
A single crystal silicon wafer having a central axis, a front side and a back side which are generally perpendicular to the axis, a circumferential edge, and a radius extending from the central axis to the circumferential edge of the wafer, the wafer comprising: an interstitial-dominated, axially symmetric region extending radially inward from the circumferential edge which is substantially free of A type agglomerated interstitial defects; and, a vacancy-dominated, axially symmetric region extending radially inward from the interstitial-dominated region and containing agglomerated vacancy defects, wherein the concentration of agglomerated vacancy defects is greater than 10 3 defects/cm 3 , and further wherein, upon being subjected to an oxidation treatment, an oxidation induced stacking fault concentration is less than about 50/cm 2 .