Patent ID: 7960203

Claim:
A method of manufacturing an electrode comprising: providing a pillar of at least a first phase change material positioned on a conductive structure positioned in a dielectric layer, wherein the first phase change material includes at least one of Te, Ga, In, Se and S; forming an insulating material abutting the pillar of the first phase change material and atop the conductive structure, wherein an upper surface of the insulating material is coplanar with an upper surface of the pillar; recessing the upper surface of the pillar below the upper surface of the insulating material to provide a recessed pillar; and forming a second phase change material atop the recessed pillar and the upper surface of the insulating material, the second phase change material includes at least one of Te, Ga, In, Se and S, wherein the second phase change material has a greater phase resistivity than the first phase change material.