Patent ID: 8097519

Claim:
A method, comprising: forming a first opening in a first device region and a plurality of trench openings in a second device region of an active semiconductor layer formed above a buried insulating layer and a substrate semiconductor layer of an SOI substrate, said first opening and trench openings extending to said buried insulating layer; masking said second device region; removing a first portion of said buried insulating layer exposed by said first opening without exposing said substrate semiconductor layer, wherein a second portion of said buried insulating layer remains above said substrate semiconductor layer and is exposed by said first opening; selectively implanting a dopant species into said substrate semiconductor layer by introducing a single-ionized dopant species through said first opening and through said second portion of said buried insulating layer exposed by said first opening; filling said first opening and said plurality of trench openings so as to form trench isolation structures in said second device region after selectively implanting said dopant species; forming gate electrode structures in said second device region; exposing a first portion and a second portion of said substrate semiconductor layer in said first device region; and forming drain and source regions in said active semiconductor layer and a diode structure in said exposed first and second portions of said substrate semiconductor layer.