Patent ID: 7948050

Claim:
A semiconductor structure comprising a middle section and two terminal sections arranged along a longitudinal axis of said semiconductor structure, the two terminal sections located at opposite ends of the middle section, wherein a semiconductor core extends through the middle section and two terminal sections of the semiconductor structure, and wherein a semiconductor shell having a substantially cylindrical outer surface is in direct contact with an entire perimeter of the semiconductor core at the two terminal sections of the semiconductor structure, but not at the middle section of the semiconductor structure where the semiconductor core is exposed, wherein the semiconductor core has a first dopant concentration extends along the longitudinal axis through the multiple sections of the semiconductor structure, and wherein the semiconductor shell having a second, higher dopant concentration encircles a portion of the semiconductor core at one or more, but not all, sections of the semiconductor structure, wherein the first dopant concentration and the second, higher dopant concentration is either a p-type or n-type dopant, wherein the first dopant concentration ranges from 10 11 to 10 17 atoms/cm 3 , and wherein the second, higher dopant concentration ranges from 10 17 to 10 21 atoms/cm 3 .