Patent ID: 7972976

Claim:
A method of forming a layer comprising conductive lines on a substrate, the method comprising: (a) providing a layer of composite dielectric material on the substrate, wherein the composite dielectric material comprises a dielectric network and a porogen, and wherein the dielectric network comprises carbon-carbon unsaturated bonds, wherein the dielectric network is formed using a precursor selected from the group consisting of ethynyltrimethylsilane (ETMS), propargyltrimethylsilane (PTMS), propargyloxytrimethylsilane (POTMS), bis(trimethylsilyl)acetylene (BTMSA), 1,3-diethynyltetramethyldisiloxane (DTDS), dimethylmethoxysilaneacetylene (DMMOSA), methyldimethoxysilaneacetylene (MDMOSA), dimethylethoxysilaneacetylene (DMESA), methyldiethoxysilaneacetylene (MDEOSA), dimethylsilane-diacetylene (DMSDA) and methylsilane-triacetylene (MSTA); (b) patterning the layer of composite dielectric material to define paths for the conductive lines; (c) filling the paths with conductive material; (d) after filling the paths in (c), removing at least some of the porogen from the layer of composite dielectric material to produce a porous dielectric network.