Patent ID: 7404985
Filing Date: 2008-07-29
Classification: C23C,H01L

Abstract:
1. A method of forming an interconnect structure, comprising: (a) providing a substrate structure to a process chamber; wherein the substrate structure includes an insulating material layer having vias defined therethrough to a contact metal; (b) forming a tungsten-containing barrier layer on the contact metal inside the vias; (c) forming a cobalt metal layer on the tungsten-containing barrier layer using a cyclical deposition process, wherein the cyclical deposition process includes a plurality of cycles and wherein each cycle comprises establishing a flow of an inert gas in the process chamber and modulating the flow of the inert gas with alternating periods of exposure to one of a cobalt metal-containing precursor and a silane-containing reducing gas; wherein the cobalt metal-containing precursor is selected from the group consisting of (cyclopentadienyl)(cyclohexadienyl) cobalt, (cyclobutadienyl)(cyclopentadienyl) cobalt, bis(cyclopentadienyl) cobalt, bis(methylcyclopentadienyl) cobalt, cyclopentadienyl(1,3-hexadienyl) cobalt, (cyclopentadienyl)(5-methylcyclopentadienyl) cobalt, and bis(ethylene) (pentamethylcyclopentadienyl) cobalt; and (d) depositing a copper layer on the cobalt metal layer.