Patent ID: 7884012
Filing Date: 2011-02-08
Classification: H01L

Abstract:
1. A method for forming a semiconductor device, the method comprising: providing a patterned substrate containing a recessed feature; depositing a barrier film on the substrate, including in the recessed feature; depositing a Ru metal film on the barrier film; depositing a discontinuous Cu seed layer on the Ru metal film, the Cu seed layer partially covering the Ru metal film in the recessed feature; exposing the substrate to an oxidation source gas that oxidizes the Cu seed layer and a portion of the Ru metal film not covered by the Cu seed layer; heat-treating the oxidized Cu seed layer and the oxidized portion of the Ru metal film (a) under high vacuum conditions including a gas pressure of 1 mTorr or less or (b) in the presence of an inert gas but not H thereafter, filling the recessed feature with bulk Cu metal.