Patent ID: 8420432

Claim:
A method of forming a semiconductor device comprising: preparing a semiconductor substrate including a first region and a second region; forming a first insulating film on the semiconductor substrate; forming a first conductive film on the first insulating film; forming a first structure on the first conductive film in the first region; forming a second structure on the first conductive film in the second region; forming a first mask pattern on the first structure and the second structure, wherein the first mask pattern includes an opening exposing at least part of the first conductive film in the first region; implanting impurity ions into the semiconductor substrate through the opening using the first mask pattern as a mask, thereby forming an impurity diffused region in the first region of the semiconductor substrate; removing the first mask pattern from the semiconductor substrate; forming a second mask pattern on the second structure, leaving part of the first conductive film, and the first structure exposed; etching the exposed part of the first conductive film, and a portion of the first structure using the second mask pattern as an etch mask to form a gate structure in the first region; and removing the second mask pattern from the semiconductor substrate to form a capacitor structure in the second region.