Patent ID: 6180450
Filing Date: 2001-01-30
Classification: H01L

Abstract:
A method of forming a DRAM storage device over a substrate comprising:forming a storage capacitor over a substrate node location laterally adjacent a substrate area in which a bit line contact is to be formed, the substrate node location being received between a pair of conductive word lines, the storage capacitor having a cell plate layer having an edge adjacent the substrate area in which the bit line contact is to be formed;forming an oxidation barrier insulative layer over the cell plate layer between the pair of conductive word lines;removing cell plate layer edge material to a degree sufficient to undercut the cell plate layer relative to material of the oxidation barrier insulative layer thereover;oxidizing the undercut cell plate layer, the oxidation barrier insulative layer serving to protect adjacent cell plate layer material during the oxidizing;after the oxidizing, outwardly exposing the substrate and defining the area in which the bit line contact is to be formed; andforming conductive material over the substrate and within the area defined by the exposing, the oxidized undercut cell plate layer being electrically insulated from the conductive material.