Method for fabricating a MOS transistor having an offset resistance
First Claim
1. A method for manufacturing a metal oxide semiconductor transistor having an offset resistance when turned off, comprising the steps of:
- forming a gate insulation layer on an active region of a substrate;
forming a gate electrode on said gate insulation layer;
forming a first photoresist pattern on said gate electrode having a central portion of said gate electrode exposed;
implanting first ions of a first conductivity type into said central portion of said gate electrode using said first photoresist pattern as a first mask;
removing said first photoresist pattern;
forming a second photoresist pattern on said central portion of said gate electrode;
implanting second ions of a second conductivity type onto opposite portions of said gate electrode adjacent said central portion using said second photoresist pattern as a second mask; and
removing said second photoresist pattern.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for fabricating a MOS transistor having an offset resistance in a channel region controlled by a gate voltage and structure thereof is disclosed. A gate electrode is divided into three adjacent regions of respectively a second conductivity type, first conductivity type and second conductivity type connected laterally to one another on a channel region. A gate control voltage is applied to a central region of the first conductivity type, and a predetermined voltage between maximum and minimum values of the gate control voltage is applied to left and right adjacent regions of the second conductivity type. If a gate turn-on voltage is applied to the central region the gate turn-on voltage is forward biased to the adjacent left and right regions and is therefore also applied to the forwardly biased left and right regions. The effective length of the gate electrode then becomes the total length of the central region and the left and right adjacent regions. If a gate turn-off voltage is applied to the central region the central region becomes reverse biased with the and left and right adjacent regions and thus the effective length of the gate electrode becomes the length of only the central region of the first conductivity type. This reduces the length of the channel region, and thus forms an offset resistance structure which reduces leakage current in the off state of the MOS transistor.
107 Citations
6 Claims
-
1. A method for manufacturing a metal oxide semiconductor transistor having an offset resistance when turned off, comprising the steps of:
-
forming a gate insulation layer on an active region of a substrate; forming a gate electrode on said gate insulation layer; forming a first photoresist pattern on said gate electrode having a central portion of said gate electrode exposed; implanting first ions of a first conductivity type into said central portion of said gate electrode using said first photoresist pattern as a first mask; removing said first photoresist pattern; forming a second photoresist pattern on said central portion of said gate electrode; implanting second ions of a second conductivity type onto opposite portions of said gate electrode adjacent said central portion using said second photoresist pattern as a second mask; and removing said second photoresist pattern. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification