Patent ID: 6037218
Filing Date: 2000-03-14
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 exposed 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, the oxidation barrier insulative layer having an outermost surface which is everywhere planar between the pair of conductive word lines;removing cell plate layer exposed edge material to a degree sufficient to undercut the cell plate layer relative to material of the oxidation barrier insulative layer;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.