Patent ID: 6548850
Filing Date: 2003-04-15
Classification: H01L

Abstract:
A trench capacitor configuration, comprising:a substrate formed with a trench; said trench having an upper region and a lower region; an insulating collar formed in said upper region; buried well disposed in said substrate, said lower region at least partly extending through said buried well; a buried plate formed around said lower region and serving as an outer capacitor electrode; a dielectric layer lining said lower region and said insulating collar, said dielectric layer serving as a capacitor dielectric; a conductive trench filling disposed in said trench; a conductive contact layer including a metal nitride disposed, between said substrate and said conductive trench filling, in said trench above said insulating collar; a conductive buried bridge disposed, above said conductive trench filling, in said trench; and said conductive buried bridge providing an electrical contact between said conductive trench filling and said conductive contact layer.