Patent ID: 6555428
Filing Date: 2003-04-29
Classification: H01L

Abstract:
A method for fabricating a ferroelectric capacitor, comprising:forming a first electrode over a substrate; forming a first layer comprising a material selected from the group consisting of PZT and PLZT on the first electrode to be a lower portion of a ferroelectric film; forming a second layer on the first layer comprising a material selected from the group consisting of titanium rich PZT containing a titanium to zirconium ratio of greater than one, titanium rich PLZT having a titanium to zirconium ratio of greater than one, and PbTiO3 to be an upper portion the ferroelectric film, wherein the upper portion of the ferroelectric film contains a higher titanium concentration than the lower portion of the ferroelectric film; and forming a second electrode over the ferroelectric film.