Patent ID: 7851253

Claim:
A method of fabricating a phase change memory device, comprising: providing a substrate with a first electrode layer formed thereon; forming a first phase change memory structure on the first electrode layer and electrically connected to the first electrode layer; forming a second phase change memory structure on the first phase change memory structure and electrically connected to the first phase change memory structure, wherein the first phase change memory structure or the second phase change memory structure comprises: forming a cup-shaped heating electrode in a first dielectric layer; forming a first insulating layer on the first dielectric layer along a first direction parallel to a side of the cup-shaped heating electrode covering a portion of the cup-shaped heating electrode; forming a first electrode structure along a second direction parallel to another side of the cup-shaped heating electrode and covering a portion of the first insulating layer and the cup-shaped heating electrode, wherein the first electrode structure comprises a pair of phase change material spacers disposed on a pair of sidewalls of the first electrode structure covering a portion of the cup-shaped heating electrode, thereby forming an intersectional contact area between one of the phase change material spacers and the cup-shaped heating electrode; and forming a second dielectric layer on the first insulating layer and the first dielectric layer and adjacent the first electrode structure.