Patent ID: 7741188

Claim:
Method of forming a deep trench metal-insulator-metal (MIM) capacitor in an SOI-type substrate having a layer of silicon (SOI) atop a buried oxide (BOX) layer which is atop an underlying substrate, comprising: forming a deep trench (DT) extending through the SOI layer and the BOX layer, and into the underlying substrate; depositing a thin, conformal layer of a first conductive material to serve as a first of two conductive electrodes for a capacitor being formed in the deep trench; removing a portion of the first conductive material from a top portion of the deep trench, recessing it to below the SOI layer; depositing a dielectric layer covering sidewalls and a bottom of the deep trench, and the first conductive material; filling the deep trench with a second conductive material, to serve as a second of the two conductive electrodes for a capacitor being formed in the deep trench; and recessing the second conductive material so that its top surface is recessed below the SOI layer.