Patent ID: 8329570

Claim:
A method of manufacturing a semiconductor device, comprising: forming a first gate electrode in a first region of a semiconductor substrate and forming a second gate electrode in a second region of the semiconductor substrate; forming a first sidewall spacer along a lateral wall of the first gate electrode and forming a second sidewall spacer along a lateral wall of the second gate electrode; forming an oxide film so as to cover the semiconductor substrate, the first gate electrode, the second gate electrode, the first sidewall spacer and the second sidewall spacer; forming a resist above the oxide film so as to cover the first region of the semiconductor substrate; removing the oxide film in the second region of the semiconductor substrate by etching the oxide film with the resist serving as a mask; removing the resist; and executing a plasma process by using a gas containing chlorine with respect to the semiconductor substrate and the oxide film in the first region of the semiconductor substrate to increase etch resistance of the oxide film against hydrofluoric acid.