Patent ID: 7585780

Claim:
A method for manufacturing a semiconductor device, the method comprising: forming an interlayer insulating film including a storage node contact plug over a semiconductor substrate; forming an etching barrier film, a sacrificial insulating film, and a hard mask film over the storage node contact plug and the interlayer insulating film, wherein the hard mask film has a stacked structure including first and second hard mask films; forming a first storage node region by selectively removing portions of the sacrificial insulating film and the hard mask film by an etching process such that etching residuals including a polymer are formed at a sidewall of the first storage node region; forming a second storage node region by selectively removing the remaining portions of the sacrificial insulating film and the etching barrier film by an etching process, thereby exposing the storage node contact plug; and, forming a dielectric film and an upper electrode over the first and second storage node regions, wherein forming the first storage node region step comprises: forming a photoresist film over the second hard mask film; exposing and developing the photoresist film with a storage node mask to form a photoresist pattern; etching the first and second hard mask films with the photoresist pattern as a mask to expose the sacrificial insulating film; removing the photoresist pattern and the second hard mask film; and removing a portion of the sacrificial insulating film with the first hard mask film to form the first storage node region.