Patent ID: 8093658
Filing Date: 2012-01-10
Classification: H01L,Y10S

Abstract:
1. A transistor comprising: a semiconductor substrate having a first doping type; two diffused regions in the substrate having a doping type opposite of the substrate forming a source region and a drain region; a channel region disposed between the source region and drain region; a dielectric layer disposed above the channel region; and a gate electrode disposed upon the dielectric layer substantially covering the channel region and having a first portion disposed above at least a portion of the source region and a second portion disposed above at least a portion of the drain region, the first portion having a material composition and the second portion including the material composition, the first portion of the gate electrode being thicker than the second portion of the gate electrode such that the material composition of the first portion and the second portion is configured as a step above the dielectric layer, the gate electrode having an applied stress condition that is different at the first portion as compared to the second portion, wherein the gate electrode includes material having an asymmetrical strain with respect to the first portion compared to the second portion based on the first portion having a composition in common with the second portion with the first portion formed under different conditions than the second portion.