Patent ID: 7871906

Claim:
A method of manufacturing a phase change memory device, the method comprising: forming an insulating interlayer on a semiconductor substrate; forming a hole in the insulating interlayer to expose the semiconductor substrate; forming a diode in a lower region of the hole; forming a diode electrode on the diode so that an exposed surface of the diode electrode is non-planar, wherein the forming of the diode electrode includes, forming an annular spacer so that the annular spacer contacts the diode and covers a sidewall of the hole, forming a recess in a top surface of the diode inside the annular spacer, and covering a surface of the recess with a conductive layer; forming a bottom electrode in contact with and conforming to the non-planar surface of the diode electrode; and sequentially forming a phase change layer and a top electrode on the bottom electrode.