Patent ID: 7727850

Claim:
A method for forming a capacitor of a semiconductor device, the method comprising the steps of: forming a first interlayer insulating film over a semiconductor substrate; etching the first interlayer insulating film by a photo-etching process with a storage node contact mask to form a first storage node trench; sequentially forming a second interlayer insulating film and a third interlayer insulating film over the first interlayer insulating film including the first storage node trench; etching the second interlayer insulating film and the third interlayer insulating film by a photo-etching process with a storage node mask to form a second storage node trench; forming a storage node conductive layer over the first storage node trench and the second storage node trench to form a storage node; and sequentially forming a dielectric film and an top electrode over the storage node conductive layer, the dielectric film filling the first storage node trench and the second storage node trench.