Patent ID: 8754461

Claim:
A structure comprising: a deep trench extending into a silicon-on-insulator (SOI) substrate, the deep trench comprising a sidewall, a top, and a bottom; a node dielectric located entirely below a buried oxide layer of the SOI substrate and adjacent to the sidewall and the bottom of the deep trench; a first conductive layer located directly on top of the node dielectric; a second conductive layer located directly on top of the first conductive layer, the second conductive layer filling the deep trench to a level at or below the first conductive layer; a spacer located along the sidewall of the deep trench and extending from a location between a top surface and a bottom surface of the buried oxide layer to the node dielectric located below the buried oxide layer; and a third conductive layer located on top of the first conductive layer, the second conductive layer, and the spacer, the third conductive layer filling the deep trench to a level equal with the top of the deep trench.