Patent ID: 6204176
Filing Date: 2001-03-20
Classification: C23C

Abstract:
A method for depositing a copper (Cu) seed layer on a Cu-receiving surface of an integrated circuit (IC) wafer in a chamber having a chuck, on which the IC is mounted, and having a showerhead vapor distribution system, comprising the steps of:a) in said chamber, establishing a vaporizing temperature in the range of 60 to 80 degrees C.;establishing a chuck temperature in the range of approximately 140 to 230 degrees C.;establishing a chamber pressure in the range of approximately 0.1 to 2 torr (T);establishing a distance between the showerhead and the Cu-receiving surface in the range of 15 to 60 millimeters (mm); andestablishing a helium carrier gas flow rate, to carry the Cu precursor compound vapor, in the range of 10 to 400 standard cubic centimeters (sccm);establishing a liquid precursor flow rate in the range of 0.05 to 0.7 milliliters pre minute (mL/min); andvolatizing a Cu precursor compound including Cu.sup.+1 (hexafluoroacetylacetonate), and a substituted phenylethylene ligand having the following structural formula:(C.sub.6 H.sub.5)(R.sup.1)C.dbd.C(R.sup.2)(R.sup.3)in which R.sup.1 is selected from the group consisting of C.sub.1 to C.sub.6 alkyl, C.sub.1 to C.sub.6 haloalkyl, phenyl, and C.sub.1 to C.sub.6 alkoxyl;in which R.sup.2 is selected from the group consisting of H, C.sub.1 to C.sub.6 alkyl, phenyl, and C.sub.1 to C.sub.6 alkoxyl; andin which R.sup.3 is selected from the group consisting of H, C.sub.1 to C.sub.6 alkyl, phenyl, and C.sub.1 to C.sub.6 alkoxyl;b) decomposing the Cu precursor compound on the Cu-receiving surface of the IC wafer to form a Cu seed-layer, whereby the seed layer is formed through chemical vapor deposition (CVD); andc) forming a second layer of Cu overlying the Cu seed layer, whereby the Cu seed layer enhances adhesion between the Cu films and Cu-receiving surface.