Patent ID: 7151289

Claim:
A ferroelectric capacitor comprising: a bottom electrode which has a first region and a second region, wherein the first region has a first thickness and the second region has a second thickness greater than the first thickness, and wherein the second region is arranged at a central area of the bottom electrode and the first region is arranged at a peripheral area of the bottom electrode; a dielectric layer formed on the first region of the bottom electrode; a ferroelectric layer formed on the dielectric layer and on the second region of the bottom electrode; and a top electrode formed on the ferroelectric layer, wherein the dielectric layer is sandwiched between the first region of the bottom electrode and the ferroelectric layer, wherein a side end surface of the first region of the bottom electrode, a side end surface of the dielectric layer, a side end surface of the ferroelectric layer and a side end surface of the top electrode are aligned, and wherein a distance between the bottom electrode and the top electrode at the side end surfaces is greater than a distance between the bottom electrode and the top electrode at the second region.