Patent ID: 7320912
Filing Date: 2008-01-22
Classification: H01L

Abstract:
1. A method for forming a trench capacitor in a substrate, the method comprising: removing a portion of the substrate to form a trench within the substrate; forming at least one buried isolation layer within the substrate, the buried isolation layer intersecting with the trench and having at least one gap providing body contact between a first substrate area above the buried isolation layer and a second substrate area below the buried isolation layer, the step of forming the at least one buried isolation layer within the substrate further including: forming in the substrate a first electrode of the trench capacitor at least in areas surrounding a lower portion of the trench; forming a dielectric layer of the trench capacitor, the dielectric layer covering a surface of the trench at least for the portion below the buried isolation layer; and forming a second electrode of the trench capacitor in the trench.