Patent ID: 6258716
Filing Date: 2001-07-10
Classification: C23C,H01L

Abstract:
A method of filling contact holes, comprising the steps of:providing an integrated circuit wafer having devices formed therein and an electrode pattern formed thereon;forming a layer of dielectric having a first surface and a second surface on said integrated circuit wafer, wherein said second surface of said layer of dielectric contacts said integrated circuit wafer;forming contact holes, wherein each said contact hole has sidewalls and a bottom, in said layer of dielectric;depositing a titanium silicide adhesion layer on said integrated circuit wafer, after forming said contact holes in said layer of dielectric, thereby depositing part of said titanium silicide adhesion layer on said sidewalls and said bottom of each of said contact holes as well as on said first surface of said layer of dielectric, wherein said depositing said titanium silicide adhesion layer is accomplished using chemical vapor deposition adjusted so that that part of said titanium silicide adhesion layer deposited on said bottom of each said contact hole is thicker than that part of said titanium silicide adhesion layer deposited on said sidewalls of each said contact hole or on said first surface of said layer of dielectric;removing that part of said titanium silicide adhesion layer above the plane formed by said first surface of said layer of dielectric by means of reactive ion etching wherein said reactive ion etching is carried out in-situ or ex-situ after depositing said titanium silicide adhesion layer, thereby leaving part of said titanium silicide adhesion layer on said sidewalls and said bottom of each of said contact holes; andselectively depositing a conductor metal on said titanium silicide adhesion layer on said sidewalls and bottom of each of said contact holes by means of chemical vapor deposition, after removing that part of said titanium silicide adhesion layer above the plane formed by said first surface of said layer of dielectric, thereby filling said contact holes.