Patent ID: 6835607
Filing Date: 2004-12-28
Classification: H01L

Abstract:
A method for forming a semiconductor device comprising:forming a semiconductor film over a substrate; forming a first insulating film comprising silicon oxide over said semiconductor film; forming a gate electrode over said first insulating film; patterning said first insulating film into a second insulating film comprising silicon oxide; introducing an impurity into said semiconductor film using said gate electrode and said second insulating film as masks to form a source region and a drain region in said semiconductor film outside said second insulating film and to form a high resistivity impurity region under a part of said second insulating film which extends beyond said gate electrode; thinning said part of said second insulating film which extends beyond said gate electrode; forming a third insulating film comprising silicon nitride over at least said part of said second insulating film which extends beyond said gate electrode; and forming a fourth insulating film comprising silicon oxide over said third insulating film and over said pert of said second insulating film which extends beyond said gate electrode, wherein said fourth insulating film is formed by using TEOS.