Methods of fabricating an interconnect, which fundamentally comprises forming a second conductive film (e.g., aluminum) over first conductive film (e.g., copper) deposited in an opening formed in a dielectric layer (e.g., low-k dielectric). The second conductive film has an ability to reflow to form a planar surface upon a thermal treatment process. Electropolishing is then used to planarize the second and first conductive films, wherein an electrolyte solution selective to remove the first conductive film faster than the second conductive film is used. An interconnect is formed.

 
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