Patent ID: 8471340

Claim:
A semiconductor structure comprise: a semiconductor substrate a first surface and a second surface opposite said first surface, said semiconductor substrate comprising; a first portion adjacent to said first surface and comprising, in a first concentration, a dopant having a given conductivity type such that said first portion has said given conductivity type; and a second portion extending from said first portion to said second surface, said second portion comprising, in a second concentration greater than said first concentration, any of the following such that said second portion has said given conductivity type: a same dopant as in said first portion, a different dopant than in said first portion, said different dopant having said given conductivity type, and a combination of said same dopant as in said first portion and said different dopant than in said first portion; an insulator layer on said semiconductor substrate immediately adjacent to said second surface; and at least one semiconductor device on said insulator layer directly above said first portion and said second portion.