Patent ID: 7074725

Claim:
A method for forming a storage node of a capacitor, the method comprising: etching a portion of an insulation film on a semiconductor substrate, thereby forming a first opening in the insulation film; forming a passivation film on the insulation film and within the first opening thereof, wherein a portion of the passivation film on a bottom of the first opening is predetermined to be thinner than portions of the passivation film on the insulation film and on sidewalls of the first opening, and wherein the thickness of the portion of the passivation film on the sidewalls is substantially constant; etching the passivation film until the bottom of the first opening is exposed, while leaving at least a portion of the passivation film on a top surface of the insulation film and on the sidewalls of the first opening; filling the first opening with a buried layer; forming an interlayer dielectric film on the buried layer and on the insulation film; anisotropically etching a portion of the interlayer dielectric film, until a top surface of the buried layer is exposed, to form a second opening in the interlayer dielectric film; wet etching the exposed buried layer through the second opening to form opening regions; forming a conductive film on the interlayer dielectric film including the opening regions; and removing a portion of the conductive film on the interlayer dielectric film to form a conductive pattern as a storage node.