Patent ID: 8049261

Claim:
A semiconductor structure, comprising: a semiconductor material comprising a conductive substrate; a first dielectric material below a surface of the semiconductor material; one or more trenches in the first dielectric material, wherein the conductive substrate is disposed below the trenches of the capacitor and separated from the trenches of the capacitor by the dielectric material; a capacitor formed in the one or more trenches, the capacitor including a first conductive material formed over the semiconductor material surface and lining the sidewalls and bottoms of the one or more trenches formed in the first dielectric material to provide a first plate of the capacitor, a second dielectric material formed over the first plate of the capacitor and a second conductive material formed within the second dielectric material to provide a second plate of the capacitor; wherein the second conductive material comprises a substantially planar portion, the substantially planar portion being disposed over two or more of the trenches external to the trenches, and wherein the second conductive material comprises a plurality of extensions that extend from the substantially planar portion into the trenches, wherein in a given trench the extension is surrounded on opposite sides of the trench by first conductive material; and first and second electrical interconnects to the capacitor extending above a surface of the second dielectric material, the first electrical interconnect coupled to the first conductive material, and the second electrical interconnect coupled to the second conductive material.