Patent ID: 9034709
Filing Date: 2015-05-19
Classification: H01L,Y10S

Abstract:
1. A method for manufacturing a semiconductor device, the semiconductor device including a first MOS transistor in a first region of a semiconductor substrate and a second MOS transistor in a second region of the semiconductor substrate, the method comprising: forming a first gate oxide film in each of the first region and the second region by thermally oxidizing the semiconductor substrate; forming a protective film on the first gate oxide film; implanting fluorine into each of the first region and the second region through the protective film and the first gate oxide film; removing, after the implantation of the fluoride, the protective film from the first gate oxide film in the second region; removing the first gate oxide film from the second region; and forming a second gate oxide film in the second region by thermally oxidizing the semiconductor substrate in a state where the first gate oxide film is left in the first region and the first gate oxide film is removed from the second region, the second gate oxide film being different in thickness or type from the first gate oxide film.