Patent ID: 7973372

Claim:
A structure comprising a field-effect transistor provided along an upper surface of a semiconductor body having body material of a first conductivity type, the transistor comprising: a channel zone of the body material; first and second source/drain (“S/D”) 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; a gate dielectric layer overlying the channel zone; and a gate electrode overlying the gate dielectric layer above the channel zone, each S/D zone comprising a main S/D portion and a more lightly doped lateral S/D extension laterally continuous with the main S/D portion and extending laterally under the gate electrode such that the channel zone is terminated by the S/D extensions along the body's upper surface, the S/D extensions of the first and second S/D zones being respectively largely defined by first and second semiconductor dopants of the second conductivity type, the first dopant of the second conductivity type being of higher atomic weight than the second dopant of the second conductivity type.