Patent ID: 8709903

Claim:
A method of forming a semiconductor structure comprises: forming a semiconductor substrate having a first surface and a second surface opposite said first surface; forming an insulator layer on and immediately adjacent to said second surface; performing additional processing so as to form in said semiconductor substrate: a first portion immediately 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 vertically from immediately adjacent to said first portion to said second surface immediately adjacent to said insulator layer and comprising, in a second concentration greater than said first concentration, one of a same dopant as said dopant in said first portion, a different dopant than said dopant in said first portion, wherein said different dopant has said given conductivity type, and a combination of said same dopant as said dopant in said first portion and said different dopant than said dopant in said first portion such that said second portion has said given conductivity type at a higher conductivity level than said first portion; and, forming a device layer on said insulator layer, said device layer comprising multiple semiconductor devices and said first portion and said second portion of said semiconductor substrate each extending laterally and continuously so as to traverse below each of said multiple semiconductor devices.