Patent ID: 6528384
Filing Date: 2003-03-04
Classification: H01L

Abstract:
A method for manufacturing a trench capacitor, the method which comprises:(a) providing a substrate; (b) forming a trench with a lower region and an upper region in the substrate; (c) filling the lower region of the trench with a first filler material; (d) forming an insulation collar in the upper region of the trench; (e) removing the first filler material from the lower region of the trench; (f) forming a buried plate as a first capacitor plate in the substrate such that the buried plate is disposed adjacent the lower region of the trench and using a pressure below 200 Pascal for a low-pressure gas phase doping for forming the buried plate; (g) forming a dielectric layer as a capacitor dielectric lining the lower region of the trench and an inner side of the insulation collar; and (h) filling the trench with a conductive second filler material as a second capacitor plate.