Patent ID: 8723244

Claim:
A semiconductor device comprising: a transistor formed in a semiconductor substrate; a conductive material having a landing portion and a connecting portion, the connecting portion connecting electrically to the transistor, the landing portion including a landing surface and a side surface, the landing surface having a concave section that is smaller in area than the landing surface, and the side surface extending downwardly from the landing surface; an etching stopper film formed in contact with at least a part of the side surface of the landing portion to surround the landing portion, the etching stopper film having a window that is opened to expose at least a part of the landing surface; a lower electrode being disposed on the conductive material and covering an inner part of the window of the etching stopper film such that the etching stopper film contacts a side surface of the lower electrode, the lower electrode being in contact with the concave section of the landing surface, and the lower electrode further comprising a cup shape that includes an inner surface and an outer surface; a capacitive insulating film formed on the side surface of the lower electrode, such that the etching stopper film is formed between the capacitive insulating film and the side surface of the landing portion of the conductive material; and a plate electrode formed on the etching stopper film and the capacitive insulating film, such that the capacitive insulating film is formed between the side surface of the lower electrode and the plate electrode.