Patent ID: 6066541
Filing Date: 2000-05-23
Classification: H01L

Abstract:
A method for fabricating a cylindrical capacitor on a substrate having a source region, a drain region, and a gate electrode, comprising the steps of:(a) forming an insulating layer over surface of said substrate;(b) forming sequentially a barrier layer, a sacrificing layer and a mask layer over said insulating layer;(c) forming a contact hole through said mask layer, said sacrificing layer, said barrier layer, and said insulating layer exposing said source region;(d) forming spacers on the sidewalls of said contact hole;(e) forming a first conductive layer over said mask layer and filling said contact hole thereby forming an electrical connection to said source region;(f) patterning said first conductive layer to form a storage electrode of said capacitor, said patterning forming exposed portions and unexposed portions of said mask layer;(g) removing said exposed portions of said mask layer;(h) isotropically etching said sacrificing layer using said unexposed portions, said spacers and said barrier layer as stopping layers;(i) forming a dielectric layer over said storage electrode; and(j) forming a second conductive layer as an opposite electrode over said dielectric layer thereby completing said capacitor.