Patent ID: 6881990
Filing Date: 2005-04-19
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first impurity doped region of a second conductivity type formed in a semiconductor substrate of a first conductivity type; a second impurity doped region of the first conductivity type formed in the semiconductor substrate of the first conductivity type; a first gate insulation film formed on the first impurity doped region; a first gate electrode formed on the first gate insulation film; a second gate insulation film formed on the second impurity doped region; a second gate electrode formed on the second gate insulation film; a first sidewall insulation film formed on either side of the first gate electrode; a second sidewall insulation film whose thickness differs from that of the first sidewall insulation film, the second sidewall insulation film being formed on either side of the second gate electrode; a third sidewall insulation film formed on the first sidewall insulation film on the side of the first gate electrode; and a fourth sidewall insulation film whose thickness differs from that of the third sidewall insulation film, the fourth sidewall insulation film being formed on the second sidewall insulation film on the side of the second gate electrode.