Patent ID: 6133110
Filing Date: 2000-10-17
Classification: H01L

Abstract:
A method of manufacturing a dual cylinder-shaped capacitor, the method comprising the steps of:providing a substrate that has at least one source/drain region;depositing silicon oxide over the substrate and then patterning the silicon oxide layer to expose the source/drain region;forming a silicon nitride layer on the silicon oxide layer;forming a conductive layer over the silicon oxide layer so that the source/drain region is electrically connected;forming a cylindrical oxide layer above the conductive layer;forming silicon nitride spacers on the sidewalls of the cylindrical oxide layer;forming first oxide spacers on the sidewalls of the silicon nitride spacers:removing a portion of the conductive layer to expose the silicon nitride layer;removing the cylindrical oxide layer and the first oxide spacers;forming a second oxide spacer and a third oxide spacer on each side of the silicon nitride spacer wherein the second oxide spacer covers a portion of the silicon nitride layer;removing the silicon nitride spacers and the exposed silicon nitride layer so that the silicon nitride layer covered by the remaining conductive layer and the second spacer remains; andremoving a portion of the conductive layer to form a dual cylinder-shaped lower electrode using the second oxide spacers and the third oxide spacers as masks.