Patent ID: 6962846

Claim:
A method of forming a double-sided capacitor having increased capacitance, comprising: forming a first opening in a first insulating layer on a semiconductor wafer; forming a first sacrificial liner along sidewalls of the first opening; forming a sacrificial plug adjacent to the first sacrificial liner, the sacrificial plug formed from a material having a different etch selectivity than a material used in the first sacrificial liner; forming a second insulating layer over the first insulating layer; forming a second opening in the second insulating layer, the second opening in substantial alignment with the first opening; forming a second sacrificial liner along sidewalls of the second opening; removing the sacrificial plug; forming a first conductive layer over the first and second sacrificial liners, the first conductive layer having a first surface and a second surface, wherein the first surface of the first conductive layer contacts the first and second sacrificial liners; selectively removing the first and second sacrificial liners to expose the first surface of the first conductive layer; forming a dielectric layer over the first and second surfaces of the first conductive layer; and forming a second conductive layer over the dielectric layer.