Patent ID: 6548842
Filing Date: 2003-04-15
Classification: H01L

Abstract:
A structure comprising a principal field-effect transistor comprising:a channel zone of body material of a semiconductor body having an upper surface, the body material being of a first conductivity type; a pair of source/drain zones situated in the semiconductor body along its upper surface, laterally separated by the channel zone, and being of a second conductivity type opposite to the first conductivity type so as to form respective pn junctions with the body material, the channel zone having a net dopant concentration that longitudinally reaches a local surface minimum along the body's upper surface at a location between the source/drain zones, a channel surface depletion region extending along the body's upper surface into the channel zone, the body material having a net dopant concentration that reaches a primary local subsurface maximum below the channel surface depletion region, the primary local subsurface maximum occurring more than 0.1 &mgr;m below the body's upper surface but not more than 0.4 &mgr;m below the body's upper surface; a gate dielectric layer overlying the channel zone; and a gate electrode overlying the gate dielectric layer above the channel zone.