Patent ID: 6828191
Filing Date: 2004-12-07
Classification: H01L

Abstract:
A method for producing a trench capacitor, which comprises the following steps:providing a substrate; forming a trench with a lower region and an upper region in the substrate; filling the lower region of the trench with a first filling material; forming an insulation collar in the upper region of the trench; removing the first filling material from the lower region of the trench; lining the lower region of the trench and an inner side of the insulation collar with a dielectric layer as a capacitor dielectric; filling the trench with a conductive second filling material as a capacitor plate; providing a buried contact region for said capacitor plate underneath a surface of said substrate; forming a doped region in said buried contact region by introducing a dopant into the substrate in a region underneath a surface of the substrate by at least one process selected from the group consisting of implantation, plasma doping, and vapor phase deposition without requiring out-diffusing; and forming a tunnel layer on an interface of the buried contact region, wherein the method of performing the steps of providing the buried contact region and forming the tunnel layer comprises loading the substrate in a process chamber and providing the buried contact region and forming the tunnel layer in a single process sequence without removing the substrate from the process chamber.