Patent ID: 6010943
Filing Date: 2000-01-04
Classification: H01L

Abstract:
A method of fabricating cylindrical capacitors comprising the steps of:providing a substrate;forming a gate over the substrate and forming a source/drain region in the substrate;forming an insulating layer over the substrate and the gate;forming a contact opening in the insulating layer that exposes a portion of the source/drain region;forming a first conductive layer over the insulating layer and then patterning the first conductive layer, wherein the patterned first conductive layer is able to connect electrically with one of the source/drain regions through the contact opening;forming a first deep ultra-violet photoresist layer over the insulating layer and the conductive layer;forming a hard mask layer over the first deep ultra-violet photoresist layer;forming a second deep ultra-violet photoresist layer over the hard mask layer with an opening pattern above the contact opening;patterning the hard mask layer and the first deep ultra-violet photoresist layer using the second deep ultra-violet photoresist layer as a mask and forming an opening in the first deep ultra-violet photoresist layer to expose a portion of the first conductive layer;removing the second deep ultra-violet photoresist layer;forming a silicon layer on a sidewall of the opening in the first deep ultra-violet photoresist layer by a silylation operation;removing the hard mask layer and the first deep ultra-violet photoresist layer to expose the insulating layer and the silicon layer, wherein the silicon layer and the first conductive layer together form a lower electrode of the capacitor;forming a dielectric layer over the lower electrode; andforming a second conductive layer over the dielectric layer, wherein the second conductive layer functions as an upper electrode of the capacitor.