Patent ID: 6277688
Filing Date: 2001-08-21
Classification: H01L

Abstract:
A method for forming a capacitor on a semiconductor substrate, said method comprising the steps of:forming a dielectric isolation interlayer above said semiconductor substrate;forming an opening in said interlayer to expose a contact area of said substrate;forming a conductive plug in a bottom portion of said opening to make an electrical connection with said contact area;forming a conductive spacer on a sidewall of said opening;forming a dielectric spacer on a sidewall of said conductive spacer, said dielectric spacer defining a channel in said opening;forming an conductive column in said channel by filling said channel with conductive material;selectively removing said dielectric spacer, while leaving said conductive spacer, said conductive column, and said conductive plug to serve as a bottom storage node of said capacitor;forming a capacitor dielectric layer over said bottom storage node; andforming a conductive layer over said capacitor dielectric layer to serve as a top storage node of said capacitor.