Patent ID: 6919212

Claim:
A method for fabricating a ferroelectric random access memory device, comprising the steps of: forming a first inter-layer insulation layer on a substrate; forming a storage node contact by passing through the first inter-layer insulation layer; forming a lower electrode connected to the storage node contact on the first inter-layer insulation layer; forming a second inter-layer insulation layer having a surface level lower than that of the lower electrode by depositing a first insulation layer on the first inter-layer insulation layer and the lower electrode and performing a blanket etch-back process to the first insulation layer until a surface of the lower electrode is exposed; forming an impurity diffusion barrier layer encompassing upper side walls of the lower electrode on the second inter-layer insulation layer; forming a ferroelectric layer on the lower electrode and the impurity diffusion barrier layer; and forming a top electrode on the ferroelectric layer.