Patent ID: 6946340

Claim:
A method for fabricating a high density ferroelectric memory device, comprising: forming an interlayer dielectric film on a semiconductor substrate after forming a transistor on the semiconductor substrate; selectively etching the interlayer dielectric film to form a contact hole; burying a plug and a barrier film into the contact hole; forming a conductive film on the interlayer dielectric film including the barrier film, wherein the conductive film is formed by using iridium or ruthenium; selectively etching the conductive film to make both ends of the conductive film inclined so as to form a capping layer for capping the barrier film; forming a lower electrode on the interlayer dielectric film including the capping layer, the lower electrode comprising a material different from the capping layer; forming a ferroelectric thin film on the lower electrode; and forming an upper electrode on the ferroelectric thin film.