Patent ID: 6943110
Filing Date: 2005-09-13
Classification: H01L

Abstract:
1. A method of forming silicide materials on a silicon based substrate comprising the steps of: (a) depositing a first metal layer on the silicon based substrate, said first metal layer including Cobalt (Co); and (b) depositing a second metal layer on at least selected portions of the first metal layer, said second metal layer including an alloy of Cobalt and a refractory metal; and (c) performing a first heat treatment so as to convert at least part of said first metal layer and the silicon based substrate into a first silicide composition having one or more cobalt silicide phases, said one or more cobalt silicide phases being characterized by a first resistitivity; (d) performing a second heat treatment so as to convert said first composition, including said one or more cobalt silicide phases, into a second silicide composition containing primarily a lower resistivity cobalt silicide phase, said lower resistivity cobalt silicide phase having a resistivity substantially less than said first resistivity.