Patent ID: 8621746

Claim:
A method for making phase change memory, the method comprising: providing a substrate; locating a plurality of first row electrode leads and a plurality of second row electrode leads on a surface of the substrate; applying a carbon nanotube layer on the substrate to cover the first row electrode leads and the second row electrode leads; patterning the carbon nanotube layer to form a plurality of carbon nanotube units located on the second row electrode leads; forming a phase change layer on a surface of each carbon nanotube unit, wherein the phase change layer comprises a phase change material, and the phase change material is capable of changing phase between crystalline state and amorphous state; locating a plurality of first column electrode leads and a plurality of second column electrode leads on the surface of the substrate, wherein each of the second column electrode leads is electrically connected with the phase change layer; and locating a plurality of first electrodes and a plurality of second electrodes on the surface of the substrate, wherein each of the first electrodes is electrically connected with one of the first row electrode leads and one of the carbon nanotube units, and each of the second electrodes is electrically connected with one of the first column electrode leads and one of the carbon nanotube units.