Patent ID: 7196368

Claim:
A semiconductor device, comprising: a semiconductor substrate; a plurality of dielectric films stacked on a main surface of the semiconductor substrate as stacked dielectric films, at least one of the plurality of dielectric films being a silicon nitride film; a memory cell area in which a field-effect transistor provided with a diffusion region and a conductive type of which is reverse to that of the semiconductor substrate, a gate electrode, a gate insulating film, and a capacitor are formed; and a peripheral circuit area and a first wiring formed in the peripheral circuit area, wherein: the capacitor is formed in the memory cell area, in a concave portion of a trench which is bored into more than two dielectric films of the plurality of dielectric films including the silicon nitride film, wherein the capacitor includes a first electrode, a capacitor dielectric film, and a second electrode, wherein the first electrode is formed in a crown shape and a bottom portion of the first electrode lies at a bottom of the trench, and wherein the capacitor dielectric film is formed on an inner surface of the first electrode, on an upper portion of an outer surface of the first electrode, and includes a portion formed on a portion of an upper surface of the silicon nitride film abutting the capacitor; a plurality of second wirings located over the stacked dielectric films in the peripheral circuit area, and one of the second wirings is connected to the first wiring by a plurality of plugs, which plugs are connected by stacking thereof; and an upper face of the stacked dielectric films is extended from the peripheral circuit area to the memory cell area, and at least a portion of a thickness of the stacked dielectric films is in contact with a side face of the capacitor, wherein the upper surface of the stacked dielectric films extended from the memory cell area to peripheral circuit area is flat, and, wherein an upper surface of the silicon nitride film is located higher than an upper surface of the bottom portion of the first electrode.