Patent ID: 6686278
Filing Date: 2004-02-03
Classification: H01L

Abstract:
A method for forming a plug tungsten layer, the method comprising:providing a semiconductor substrate with a dielectric layer, wherein said dielectric layer has a via hole therein; conforming a titanium layer on said dielectric layer and the sidewall and the bottom of said via hole; forming a nitride titanium layer on said titanium layer, wherein said titanium layer and said nitride titanium layer stack to form a barrier layer; treating said barrier layer by way of using a plasma process; transporting a mixing gas having a hydrogen and a silane on said barrier layer to adsorb said mixing gas on said barrier layer; performing a purge/vacuum process to remove remainder after absorption; transporting a reactive gas with a tungsten on said barrier layer with said mixing gas to carry out a substitution reaction of said mixing and said reactive gas, so as to form a continuous tungsten seed layer on said barrier layer; forming a tungsten layer on said continuous tungsten seed layer; and forming said plug tungsten layer in said via hole.