Patent ID: 6514824
Filing Date: 2003-02-04
Classification: H01L

Abstract:
A method of forming a semiconductor device having first and second transistors, the method comprising:(a) forming in a semiconductor substrate of a first type of conductivity respective drain and source regions for the first and second transistors, wherein the source and drain regions are of a second type of conductivity opposite the first conductivity type, wherein an area extending from each source region to an associated one of the drain regions forms a respective channel region and defines an associated channel length, and wherein the channel lengths for the first and second transistors are substantially the same; (b) forming a gate electrode above each channel region, wherein each gate electrode is disposed above the entire length of a respective one of the channels; (c) implanting a first one of the gate electrodes with a second type of dopant so that the first gate electrode is of the second type of conductivity; (d) preventing penetration of the second type of dopant into a central portion of the second one of the gate electrodes during the step (c) of implanting, wherein the central portion is disposed above the entire length of the associated channel; (e) implanting the central portion of the second one of the gate electrodes with a first type of dopant so that the central portion is of the first conductivity type; and (f) preventing penetration of the first type of dopant into the first one of the gate electrodes during the step (e) of implanting.