Patent ID: 6413853
Filing Date: 2002-07-02
Classification: C23C,H01L

Abstract:
A method of forming a tungsten plug in a semiconductor device, said method comprising:forming a contact hole in an insulating layer; forming a titanium layer in the contact hole and on the insulating layer and which titanium layer has a profile conforming to the profile of a region of the surface of the insulating layer defining the contact hole; forming a titanium nitride layer on the titanium layer and having a profile conforming to that of the titanium layer; forming a tungsten layer having a thickness of about 50 angstroms or less on the titanium nitride layer by chemical vapor deposition (CVD), wherein a portion of the contact hole remains unfilled; annealing the resulting structure comprising the tungsten layer; and subsequently depositing tungsten by CVD on the resulting structure comprising the thin tungsten layer to thereby fill in the contact hole completely.