Patent ID: 7074692

Claim:
A method of reducing boron segregation phenomena in an N channel, metal oxide semiconductor (NMOS) device via formation of a doped insulator region formed in an underlying insulator layer, comprising the steps of: forming a semiconductor layer on an underlying insulator layer, wherein said insulator overlays a semiconductor substrate; forming a hard mask layer on said semiconductor layer; defining openings in said hard mask layer and in said semiconductor layer exposing a portion of said insulator layer and creating composite stacks comprised of hard mask shapes on semiconductor shapes; laterally removing portions of said hard mask shapes exposing top portions of edges of said semiconductor shapes; performing an ion implantation procedure to place ions in portions of said insulator layer exposed in said openings, and to place ions in portions of said insulator layer underlying portions of said semiconductor shapes; performing an anneal procedure to activate said ions and forming said doped insulator region in portions of said insulator layer; filling said openings with a second insulator layer; and removing said hard mask shapes.