Patent ID: 7867898

Claim:
A method of forming an ohmic contact layer comprising: forming an insulation layer pattern on a substrate, the insulation pattern layer having an opening selectively exposing a silicon bearing layer; forming a metal layer on the exposed silicon bearing layer using an electrode-less plating process; forming a metal silicide layer from the silicon bearing layer and the metal layer using a silicidation process; and forming a conductive layer on the metal silicide layer, wherein the conductive layer comprises a tungsten layer or a composite layer of tungsten and tungsten nitride; and wherein the silicidation process comprises: performing a first heat treatment to form a preliminary metal silicide layer by reacting the metal layer and the silicon bearing layer; removing un-reacted portions of the metal layer; and performing a second heat treatment on the preliminary metal silicide layer, and wherein prior to performing the first heat treatment, forming a titanium nitride capping layer on the metal layer.