Patent ID: 7601548

Claim:
A method of fabricating a ferroelectric capacitor comprising: forming an insulation layer having a contact hole exposing an active region of a substrate; forming a contact plug in the contact hole including a plug conductive material; forming a supporting insulation layer on the insulation layer and the contact plug; patterning the supporting insulation layer to form a trench exposing a surface of the contact plug and at least portion of the insulation layer; forming an oxidation barrier conductive layer in the trench; forming a lower electrode on the oxidation barrier conductive layer; forming a ferroelectric layer on the supporting insulation layer and the lower electrode layer; forming an upper electrode layer on the ferroelectric layer; and patterning the upper electrode layer to form an upper electrode, wherein forming the oxidation barrier conductive layer comprises: forming an oxidation barrier conductive material on the supporting insulation layer in the trench; planarizing the oxidation barrier conductive material such that the supporting insulation layer is exposed; and etching back the oxidation barrier conductive material such that a surface of the oxidation barrier conductive material is recessed beneath a surface of the supporting insulation layer; forming a lower electrode material on the supporting insulation layer and in the trench, wherein forming the lower electrode is formed from forming the lower electrode material on the supporting insulation layer and in the trench; and planarizing the lower electrode material such that a surface of the lower electrode is substantially planar with a surface of the supporting insulation layer.