Patent ID: 8288275

Claim:
A method of forming a contact plug of a semiconductor device, comprising: forming an interlayer insulating layer on a semiconductor substrate on which a lower structure is formed; forming a contact hole in the interlayer insulating layer, the contact hole exposing the lower structure; forming a W layer and then a WN layer to form a W/WN barrier layer that includes fluorine in the contact hole using a pulsed nucleation layer (PNL) method, a chemical vapor deposition (CVD) method, and/or a cyclic CVD method; reducing a fluorine concentration within the W/WN barrier layer using a H 2 remote plasma treatment; forming a W-plug on the H 2 remote plasma treated W/WN barrier layer to fill the contact hole; and chemical mechanical polishing (CMP) the W-plug and then the W/WN barrier layer in order to expose the interlayer insulating layer.