Patent ID: 8975710
Filing Date: 2015-03-10
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first MOS transistor having a relatively thick gate insulating film in contact with a substrate surface; and a second MOS transistor in an active region having a relatively thin gate insulating film in contact with a channel region and a gate electrode in contact with the relatively thin gate insulating film, the relatively thick gate insulating film having a thickness greater than a thickness of the relatively thin gate insulating film, the channel region separating a source region and a drain region, the active region surrounded by a field insulating film, all of the source region and all of the drain region separated from a bird's beak region of the field insulating film by the relatively thick gate insulating film that covers an end region of the field insulating film in the active region of the second MOS transistor, the relatively thick gate insulating film completely surrounding the source region, the channel region, and the drain region, the gate electrode overlying the relatively thick gate insulating film at opposite sides of the gate electrode, the bird's beak region comprising a portion of the end region of the field insulating film extending along the active region toward the channel region.