Patent ID: 7736971

Claim:
A method for fabricating a semiconductor device, the method comprising: forming an etch stop film over a semiconductor substrate; forming a first interlayer insulating film including a storage node contact plug over the etch stop film; forming a second interlayer insulating film over the first interlayer insulating film and the storage node contact plug; forming a mask pattern over the second interlayer insulating film to expose a storage node region; selectively etching the second interlayer insulating film and the first interlayer insulating film until the etch stop film is exposed to form a recess exposing an upper surface and a sidewall of the storage node contact plug; forming a lower storage node in the recess, the storage node including a concave structure surrounding the exposed storage node contact plug; performing a dip-out process to remove the second interlayer insulating film; forming a dielectric film over the lower storage node; and depositing a plate electrode over the dielectric film to form a capacitor.