Patent ID: 6818497
Filing Date: 2004-11-16
Classification: H01L

Abstract:
A method for fabricating a capacitor, comprising:forming a contact hole in an insulating layer formed on a substrate; forming a plug in the contact hole, wherein the plug contains a nitride layer, which partially fills the contact hole, formed by performing an etch back process; forming a seed layer on the insulating layer and the nitride layer in the contact hole; forming a sacrificial layer including a trench overlapped with the contact hole; forming a Ru bottom electrode in the trench with electrochemical deposition by using ruthenium sulfamate based electrolyte, ruthenium nitrosyl sulfamate based electrolyte or [Ru2N(H2O)2X8]âˆ’3 electrolyte; removing the sacrificial layer and exposing the Ru bottom electrode, wherein the seed layer not covered with the Ru bottom electrode is exposed; removing the exposed seed layer; forming a dielectric layer on the Ru bottom electrode; and forming a top electrode on the dielectric layer.