Patent ID: 8093134

Claim:
A method for manufacturing a phase change memory device, comprising the steps of: preparing a semiconductor substrate having a conductive region; forming a heater electrode having a connection element on the semiconductor substrate, wherein the connection element is composed of carbon nanotubes, wherein the step of forming the heater electrode comprises the steps of: forming a conductive pattern on the semiconductor substrate, the conductive pattern being electrically connected with the conductive region, wherein the step of forming the conductive pattern comprises the steps of: forming a conductive layer on the semiconductor substrate, the conductive layer being electrically connected with the conductive region; forming a catalyst layer on the conductive layer; patterning the catalyst layer and the conductive layer; and defining a groove in the patterned conductive layer by etching portions of the catalyst layer and the conductive layer; and forming the connection element on an upper surface of the conductive pattern; and forming a phase change pattern on the connection element of the heater electrode.