Patent ID: 7534693

Claim:
A method of forming a capacitor comprising: providing a workpiece having a first electrode; forming a capacitor insulator layer over the first electrode; forming an etch-stop layer over the capacitor insulator layer, wherein the etch-stop layer comprises an insulating material; forming a metal-containing layer over the etch-stop layer; etching the metal-containing layer to define a second electrode having a sidewall, wherein etching is terminated before exposing the capacitor insulator layer; and exposing the workpiece to an oxidizing ambient after etching the metal-containing layer, wherein during exposing the workpiece to the oxidizing ambient, substantially all of the capacitor insulator layer is covered by the etch-stop layer, and after exposing the workpiece to the oxidizing ambient, a dielectric-containing field modification layer overlies the capacitor insulator and etch-stop layers and at least partially surrounds the second electrode.