Patent ID: 7812378

Claim:
A semiconductor device, comprising: a semiconductor substrate; and a first MOS type capacitor including a first insulating film formed on the semiconductor substrate, and a first electrode formed on the first insulating film and including silicon, the first electrode having a first concentration difference as a difference when an impurity concentration in an interface region with the first insulating film is subtracted from an impurity concentration in a top portion of the first electrode; and a second MOS type capacitor including a second insulating film formed on the semiconductor substrate, and a second electrode formed on the second insulating film and including silicon, the second electrode having a second concentration difference as a difference when an impurity concentration in an interface region with the second insulating film is subtracted from an impurity concentration in a top portion of the second electrode, wherein: the second concentration difference is larger than the first concentration difference, a thickness of the first electrode is smaller than a thickness of the second electrode, and in the second electrode, an impurity concentration distribution between a top surface and a position located lower than the top surface by the thickness of the first electrode is the same as an impurity concentration distribution of the first electrode.