Patent ID: 6350676
Filing Date: 2002-02-26
Classification: H01L

Abstract:
A method of forming high-stability metallic contacts in an integrated circuit with one or more metallized layers, including the preliminary step of providing a plurality of contact holes in a layer of dielectric material, the holes having opposite ends which open approximately flush with the layer and in an intermediate region of the circuit respectively, comprising the steps of:a) conformally depositing overall at least one prebarrier layer of a metallic material selected from the group consisting of titanium and alloys thereof and titanium nitride; b) forming a first layer of tungsten by chemical vapor deposition so as to coat all surfaces of the contact holes uniformly without filling the contact holes, c) forming a second layer consisting predominantly of aluminum by sputter deposition, under planarizing conditions, on top of said first layer so as to fill the holes, and d) forming a plurality of metallic interconnections of desired geometry by a selective removal of desired areas of the superposed aluminum and tungsten layers.