Patent ID: 8865544

Claim:
A method of forming a capacitor, comprising: forming an opening extending through a silicon-containing mass to a base; lining sidewalls of the opening with protective material; forming a first capacitor electrode material within the lined opening; the first capacitor electrode material being configured as a first capacitor electrode having sidewalls along the protective material at the sidewalls of the opening; removing at least some of the silicon-containing mass with an etch, the protective material protecting the first capacitor electrode material from being removed by the etch; after removing said at least some of the silicon-containing mass, forming a second capacitor electrode material along the sidewalls of the first capacitor electrode; the second capacitor electrode material being configured as a second capacitor electrode and being spaced from the first capacitor electrode by capacitor dielectric; and wherein the protective material is a first protective material; wherein the first capacitor electrode is container-shaped; further comprising forming second protective material within the container-shaped first capacitor electrode prior to the removing of at least some of the silicon-containing mass; wherein the second protective material is formed as a liner conformally along an interior of the container-shaped first electrode to narrow an opening within the interior of the container-shaped first electrode; and wherein the second capacitor electrode and capacitor dielectric are formed to extend into the narrowed opening within the interior of the container-shaped first electrode.