Patent ID: 7566951
Filing Date: 2009-07-28
Classification: H01L

Abstract:
1. A silicon structure having a central axis, a front surface and a back surface that are generally perpendicular to the central axis, a central plane between and parallel to the front and back surfaces, a circumferential edge, and a radius extending from the central axis to the circumferential edge, wherein the structure further comprises: a near-surface region extending substantially from the central axis to the circumferential edge and a distance, D a transition region extending substantially from the central axis to the circumferential edge and a distance, D a bulk region extending substantially from the central axis to the circumferential edge and a distance, D wherein the bulk and near-surface regions are doped with a dopant, the concentration of dopant in the near-surface region is at least 10 times the maximum concentration, c, of dopant in the bulk region, and c is greater than about 5×10