Patent ID: 6015751
Filing Date: 2000-01-18
Classification: H01L

Abstract:
A method of forming via connections, comprising the steps of:providing a substrate having a layer of first dielectric formed thereon;forming electrodes from a first conducting material, each said electrode having a top surface and sidewalls, on said layer of first dielectric, wherein said top surfaces of said electrodes have a number of contact regions;forming a first layer of second dielectric on substrate thereby covering said electrodes;etching back said first layer of said second dielectric using a first etching means thereby forming first spacers of said second dielectric on said sidewalls of said electrodes;forming a second layer of said second dielectric on said substrate thereby covering said first spacers of said second dielectric on said sidewalls of said electrodes;etching back said second layer of said second dielectric using a second etching means thereby forming second spacers of said second dielectric on said first spacers of said second dielectric and removing all of said second dielectric from said top surfaces of said electrodes, wherein said second spacers formed on said first spacers have a total spacer width;forming a layer of third dielectric on said substrate thereby covering said electrodes, said first spacers of said second dielectric and said second spacers of said second dielectric;etching via holes in said layer of third dielectric using a third etching means thereby removing said third dielectric from part or all of said contact regions of said electrodes, wherein said third etching means provides an etching rate for said third dielectric at least ten times greater than the etching rate for said second dielectric; andfilling said via holes with a second conducting material.