Patent ID: 7605073
Filing Date: 2009-10-20
Classification: H01L

Abstract:
1. A method for forming a microelectronic device having an air gap interconnect structure comprising: forming a patterned layer including an opening on a substrate; disposing a sealant layer over the patterned layer and lining the opening; disposing a barrier layer over the sealant layer, disposing an interconnect metal over the barrier layer, wherein the interconnect metal fills the opening of the patterned layer, removing portions of the interconnect metal, the barrier layer, and the sealant layer to expose the patterned layer and to form an interconnect structure including the interconnect metal, the barrier layer, and the sealant layer, removing at least a portion of the patterned layer, wherein the sealant layer protects the interconnect metal and the barrier layer from oxidation and anisotropically etching the sealant layer to expose the region of the substrate, wherein the anisotropic etch removes the portion of the sealant layer over the patterned layer, and wherein removing portions of the interconnect metal and the barrier layer includes a chemical mechanical polish.