Patent ID: 8008140

Claim:
A method for manufacturing a semiconductor device comprising the steps of: forming a gate insulating film over a semiconductor film over a substrate; forming a first conductive film over the gate insulating film; forming a second conductive film over the first conductive film; forming a resist over the second conductive film; etching the second conductive film with the use of the resist as a mask to form an etched second conductive film; etching the first conductive film to form an etched first conductive film; recessing the resist and etching the etched second conductive film by using the recessed resist as a mask to form a further etched second conductive film of which a length in a channel length direction is shorter than that of the etched first conductive film; forming sidewalls comprising silicon oxide in contact with side surfaces of the etched first conductive film and upper surfaces of the etched first conductive film; and forming a passivation film over the sidewalls, wherein a stage temperature is at −10° C. or less during the recessing the resist and etching the etched second conductive film.