Patent ID: 6063683
Filing Date: 2000-05-16
Classification: H01L

Abstract:
A method of forming a capacitor on a semiconductor substrate, said method comprising the steps of:forming a first oxide layer over said substrate;forming a nitride layer over said first oxide layer;forming a second oxide layer over said nitride layer;forming a first silicon layer over said second oxide layer;defining a node opening in said first silicon layer, said second oxide layer, and said nitride layer upon said first oxide layer;forming sidewall structures on sidewalls of said node opening;defining a contact opening in said first oxide layer under said node opening, said contact opening being defined under a region uncovered by said sidewall structures;removing said sidewall structures and a portion of said nitride layer nearby said node opening to form undercut structures under said second oxide layer;forming a second silicon layer conformably over said contact opening, said undercut structures, said node opening, and said first silicon layer;forming a filling layer over said second silicon layer;planarizing said substrate down to a surface of said second oxide layer;removing said filling layer and said second oxide layer;removing said nitride layer;forming a dielectric film conformably over said second silicon layer; andforming a conductive layer over said dielectric layer.