Patent ID: 6448173
Filing Date: 2002-09-10
Classification: H01L

Abstract:
A method of forming a dual damascene metallization structure of a multilevel microelectronic device, the device containing the dual damascene metallization structure in a first level thereof, two electrically-conductive regions in a second level thereof and electrically interconnected by the dual damascene metallization structure, and a dielectric layer separating the first and second levels of the device, the dual damascene metallization structure having a line portion with a length of greater than 100 micrometers and at least two filled vias by which the dual damascene metallization structure is terminated at opposing ends thereof by the electrically-conductive regions, the dual damascene metallization structure being formed by a dual damascene process comprising the steps of:forming vias through the dielectric layer to each of the electrically-conductive regions; forming a trench contiguous with the first and second vias but not through the dielectric layer; and filling the trench and the first and second vias by: depositing a layer of titanium by physical vapor deposition on surfaces of the dielectric layer within the vias and the trench and on surfaces of the electrically- conductive regions exposed within the vias; depositing a layer of titanium nitride by chemical vapor deposition on the layer of titanium, the layer of titanium nitride being separated from the dielectric layer and the electrically-conductive regions by the layer of titanium; depositing a layer of aluminum by chemical vapor deposition on the layer of titanium nitride, the layer of aluminum being separated from the layer of titanium by the layer of titanium nitride; and depositing an aluminum-containing alloy by physical vapor deposition on a surface of the layer of aluminum so that the aluminum-containing alloy is separated from the dielectric layer and the electrically-conductive regions by the layers of titanium, titanium nitride and aluminum; wherein the layers of titanium and titanium nitride define a diffusion barrier that terminates and separates the layer of aluminum and the aluminum-containing alloy from the two electrically-conductive regions.