Patent ID: 7045860
Filing Date: 2006-05-16
Classification: H01L

Abstract:
1. A semiconductor device comprising: a gate insulating film formed on a semiconductor substrate and comprising three insulating films each having a different thickness; a gate electrode formed on the gate insulating film; a source region and a drain region each formed adjacent the gate electrode; a channel region disposed between the source region and the drain region; and an ion implanted layer formed in the channel region only under the thinnest insulating film of the three insulating films of the gate insulating film, the ion implanted layer defining a threshold voltage of the channel region, wherein the thinnest insulating film of the three insulating films is disposed adjacent the source region and the second thinnest insulating film of the three insulating films is disposed adjacent the drain region, only one second thinnest insulating film is disposed between the source region and the drain region, and at least part of the second thinnest insulating film and at least part of the thinnest insulating film are disposed on the channel region.