Patent ID: 6020227
Filing Date: 2000-02-01
Classification: H01L

Abstract:
A method of fabricating multiple field-effect transistors from a semiconductive body having material of a first conductivity type, the method comprising the steps of:introducing semiconductor dopant of the first conductivity type simultaneously (a) into part of a first channel zone of the material of the first conductivity type situated outside a main channel portion of the first channel zone to define a threshold channel portion more heavily doped than the main channel portion and (b) into substantially all of a second channel zone of the material of the first conductivity type spaced laterally apart from the first channel zone;subsequently providing first and second gate electrodes respectively above, and insulatingly spaced apart from, the first and second channel zones; andintroducing semiconductor dopant of a second conductivity type opposite to the first conductive type (a) into a pair of laterally separated parts of the semiconductive body to define a pair of first source/drain zones of the second conductivity type laterally separated by the first channel zone such that the main and threshold channel portions of the first channel zone are electrically in series and (b) into a pair of laterally separated parts of the semiconductive body spaced laterally apart from the first source/drain zones to define a pair of second source/drain zones of the second conductivity type laterally separated by the second channel zone.