Patent ID: 6025246
Filing Date: 2000-02-15
Classification: H01L

Abstract:
A method of fabricating a capacitor comprising the steps of:forming a layer of a conductive material on a substrate;forming a patterned oxidation resisting layer on said layer of said conductive material thereby defining exposed and unexposed portions of said layer of said conductive material;forming a depression in said exposed portion of said layer of said conductive material so that sidewalls of said layer of said conductive material are defined adjacent said patterned oxidation resisting layer;after forming said depression, selectively oxidizing said exposed portion of said layer of said conductive material thereby defining an oxide etch mask covering said exposed portions of said layer of said conductive material so that said oxide etch mask comprises an inner oxide layer along said depression of said layer of said conductive material and an outer oxide layer along said sidewalls;selectively etching portions of said layer of said conductive material not covered by said oxide etch mask thereby defining a vertical structure of said conductive material extending from said substrate;coating said vertical structure of said conductive material with a dielectric layer; andforming a second conductive layer on said dielectric layer.