Patent ID: 8247873

Claim:
A semiconductor device comprising: a semiconductor substrate in which a first region and a second region are formed; a first MISFET including a first gate insulating film formed on the first region of the semiconductor substrate, a first gate electrode formed on the first gate insulating film, and a first side wall made of an insulator formed on a side surface of the first gate electrode; and a second MISFET including a second gate insulating film formed on the second region of the semiconductor substrate, a second gate electrode formed on the second gate insulating film, and a second side wall made of an insulator formed on a side surface of the second gate electrode, wherein a bottom width of the first side wall is smaller than a bottom width of the second side wall, the first side wall includes a first spacer containing hydrogen, the second side wall includes a second spacer containing a higher concentration of hydrogen than the first spacer, the first side wall includes a first inner side wall having a rectangular shape formed on a side surface of the first gate electrode, and a first outer side wall formed on a side surface of the first inner side wall, the second side wall includes a second inner side wall having a rectangular shape formed on a side surface of the second gate electrode, and a second outer side wall formed on a side surface of the second inner side wall, the first inner side wall is the first spacer, the second inner side wall is the second spacer, and a bottom width of the first outer side wall is substantially the same as a bottom width of the second outer side wall.