Patent ID: 6893913

Claim:
A method for forming a capacitor of a semiconductor device comprising the steps of: forming an interlayer insulating film on a semiconductor substrate formed with a bit line; forming a contact plug in contact with the substrate within the interlayer insulating film, forming a storage electrode of polysilicon on the interlayer insulating film in such a manner that the storage electrode comes in contact with the contact plug, forming layer of Ta 2 O 5 and Y 2 O 3 one layer over the other layer in an alternating fashion on the storage electrode according to ALD (Atomic Layer Deposition) technology, forming a dielectric film of a single composite film having Ta 2 O 6 and Y 2 O 3 on the storage electrode, depositing a diffusion barrier film on the dielectric film, and forming a plate electrode of polysilicon on the diffusion barrier film.