Patent ID: 6617242
Filing Date: 2003-09-09
Classification: H01L

Abstract:
A method for fabricating interlevel contacts in an integrated circuit, comprising the steps of:forming an opening in an insulating layer to expose a conductive region beneath; depositing a refractory metal layer over the insulating layer and within the opening; depositing aluminum at a temperature sufficient to cause the aluminum to alloy with the refractory metal at an interface thereof during deposition, wherein the alloy of aluminum and refractory metal has a volume greater than the aluminum and refractory metal alone, wherein the deposition is performed so that the alloy of aluminum and refractory metal substantially fills a portion of the opening left unfilled by the refractory metal layer without deposited aluminum within the opening, and wherein the deposited aluminum forms a layer without alloy above the opening, the deposited aluminum layer without alloy having a planar upper surface.