Patent ID: 8148777
Filing Date: 2012-04-03
Classification: H01L

Abstract:
1. A structure comprising a principal field-effect transistor (“FET”) which comprises: a principal channel zone of principal body material of a semiconductor body having an upper semiconductor surface, the body material being sufficiently doped with semiconductor dopant of a first conductivity type as to be of the first conductivity type; a pair of principal source/drain zones situated in a semiconductor body along the upper semiconductor surface, laterally separated by the channel zone, and being of a second conductivity type opposite to the first conductivity type, the body material extending laterally below the S/D zones, the dopant of the first conductivity type in the body material having a concentration that decreases by at least a factor of 10 in moving upward to a specified one of the source/drain zones from a principal underlying subsurface body-material location which is no more than 10 times deeper below the upper semiconductor surface than the specified source/drain zone; a principal gate dielectric layer overlying the channel zone; and a principal gate electrode overlying the gate dielectric layer above the channel zone.