Patent ID: 6197652
Filing Date: 2001-03-06
Classification: H01L

Abstract:
A method of fabricating a bottom electrode of a twin-tub capacitor, the method comprising the steps of:providing a substrate;forming a first dielectric layer over the substrate;forming an etching stop layer over the first dielectric layer;forming a contact window in the etching stop layer and the first dielectric layer;forming a first conductive layer, covering the etching stop layer and filling the contact window;defining the first conductive layer to expose a part of the etching stop layer;forming a plurality of column structures, wherein at least one of the column structures covers the first conductive layer, and another of the column structures completely covers the exposed etching stop layer;forming a second conductive layer along sidewalls of the column on the first conductive layer without filling spaces between the column structures; andremoving the column structures.