Patent ID: 7585692

Claim:
A method of forming a phase change memory device comprising: forming a heating electrode by forming a titanium aluminum nitride (Ti 1−x Al x N) layer; forming an insulating layer on the heating electrode, the insulating layer having a contact hole which exposes the heating electrode; and forming a phase change layer on the insulating layer, filling the contact hold and contacting the heating electrode, wherein the Ti 1−x Al x N layer is formed by atomic layer deposition (ALD), the formation method comprising one cycle including: injecting a titanium source into a reaction chamber in which a substrate is disposed; injecting a first nitrogen source into the reaction chamber; and injecting an aluminum source into the reaction chamber; wherein a concentration of Al(X) in the Ti 1−x Al x N layer is controlled by varying at least one of an injection time and a flow rate of at least one of the nitrogen source and the aluminum source, and wherein the Ti 1−x Al x N layer is formed to a thickness of 3.0 to 6.0 Å per cycle.