Patent ID: 6534809
Filing Date: 2003-03-18
Classification: H01L

Abstract:
A ferroelectric capacitor formed over a semiconductor substrate, the ferroelectric capacitor comprising:a bottom electrode formed over the semiconductor substrate, said bottom electrode comprised of a bottom electrode material; a top electrode formed over said bottom electrode and comprised of a first electrode material; a ferroelectric material situated between said top electrode and said bottom electrode; and a hardmask formed on said top electrode and comprising a bottom hardmask layer and a top hardmask layer formed on said bottom hardmask layer, said top hardmask layer able to with stand etchants used to etch said bottom electrode, said top electrode, and said ferroelectric material to leave said bottom hardmask layer substantially unremoved during said etch and said bottom hardmask layer being comprised of a conductive material which substantially acts as a hydrogen diffusion barrier.