Patent ID: 6946357

Claim:
A method of forming a semiconductor structure, comprising: forming an insulating layer on a substrate; forming an opening in the insulating layer, wherein the opening has a bottom on an exposed portion of the substrate and sidewalls defined by the insulating layer; forming a conductive layer on the insulating layer and the exposed portion of the substrate; forming a fill layer on the conductive layer, wherein the fill layer fills the opening; removing the conductive layer and the fill layer to a level below a top the insulating layer, thereby forming a container structure having sidewalls comprised of the conductive layer on the sidewalls of the opening, and a closed bottom comprised of the conductive layer on the bottom of the opening; forming a dielectric cap on a top of the sidewalls of the conductive layer, wherein forming a dielectric cap on top of the sidewalls includes forming a dielectric layer on the insulating layer, the conductive layer and the fill layer, and removing the dielectric layer from the insulating layer and the fill layer; removing the fill layer to expose an inside of the container structure; and removing at least a portion of the insulating layer to expose an outside of the container structure.