Patent ID: 7211517

Claim:
A method of manufacturing a semiconductor device comprising: sequentially forming a gate insulating film, a first conductive layer and a first insulating film on a semiconductor layer provided on an insulating film; selectively removing said semiconductor layer, said gate insulating film, said first conductive layer and said first insulating film to form a device isolation trench; forming a second insulating film in said device isolation trench, wherein a height of an upper surface of said second insulating film is substantially coincident with that of an upper surface of said first insulating film; removing a part of said second insulating film and said first insulating film such that a height of an upper surface of the exposed first conductive layer is substantially coincident with that of the top surface of the second insulating film; and patterning said first conductive layer to form a gate electrode, wherein said selectively removing is carried out such that an angle between a side plane and a bottom plane in said first conductive layer is obtuse.