Patent ID: 7939877

Claim:
A method of forming a capacitor, comprising: forming a first sacrificial material over a semiconductor substrate; forming a first opening extending through the first sacrificial material; at least partially filling the first opening with a first capacitor storage node material to form a first capacitor storage node within said first opening; the first capacitor storage node having outer lateral surfaces along the first sacrificial material; forming a second sacrificial material over the first capacitor storage node and over the first sacrificial material; forming a retaining structure over the second sacrificial material; forming a second opening through the retaining structure and the second sacrificial material to expose at least part of an upper surface of the first capacitor storage node; lining the second opening with a second capacitor storage node material to form a second capacitor storage node that is in direct physical contact with the first capacitor storage node; the second capacitor storage node having exposed inner lateral surfaces within the lined second opening, and having outer lateral surfaces along the second sacrificial material; removing the first and second sacrificial materials to expose the outer lateral surfaces of the first and second capacitor storage nodes; forming capacitor dielectric material along the exposed inner lateral surfaces of the second capacitor storage node, and along the exposed outer lateral surfaces of the first and second capacitor storage nodes; and forming capacitor electrode material along the capacitor dielectric material, and spaced from the first and second capacitor storage nodes by the capacitor dielectric material.