Patent ID: 7700980
Filing Date: 2010-04-20
Classification: H01L

Abstract:
1. A structure comprising a pair of like-polarity first and second field-effect transistors (“FETs”) provided along an upper surface of a semiconductor body having body material of a first conductivity type, each FET comprising: a channel zone of the body material; 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; a gate dielectric layer overlying the channel zone; and a gate electrode overlying the gate dielectric layer above the channel zone such that (a) the body material has a net dopant concentration which reaches a local subsurface maximum below a channel surface depletion region that extends along the body's upper surface into the channel zone and (b) the local subsurface maximum in the body material's net dopant concentration is located below largely all material of the gate electrode overlying the channel zone and occurs more than 0.1 μm below the body's upper surface but not more than 0.4 μm below the body's upper surface, wherein (i) a pocket portion of the body material more heavily doped than laterally adjacent material of the body material extends along both source/drain zones of the first FET and (ii) a pocket portion of the body material more heavily doped than laterally adjacent material of the body material extends largely along only one of the source/drain zones of the second FET and into its channel zone such that the channel zone of the second FET is asymmetrical.