Patent ID: 7268432
Filing Date: 2007-09-11
Classification: H01L

Abstract:
1. An interconnnect structure comprising: a first planar dielectric element positioned over a top surface of a substrate, said first planar dielectric element encasing a set of conductive vias having a top and a bottom and supporting a set of conductive lines on a top surface of said first dielectric, and a second planar dielectric element disposed between said set of metal conductive lines having a top surface, a bottom surface and vertical sides, said second planar dielectric element being recessed slightly below a top surface of said set of conductive lines, said set of conductive lines being disposed within said second planar dielectric element and said second planar dielectric element containing a regular array of nanocolumnar pores, said nanocolumnar pores being positioned between said metal conductive lines in second planar level dielectric and optionally extending through a portion or all of said first planar dielectric element such that the nanocolumnar pores are not present beneath said metal lines in said first planar dielectric element, being closed off at the top by a layer of a third dielectric configured to protect said top surface of the conductive lines, said third dielectric filling said recessed region and covering the top of said interconnect lines, and wherein said third dielectric is selected from the group consisting of amorphous hydrogenated silicon carbide, silicon carbonitride, silicon oxycarbide and combinations thereof.