Patent ID: 7468330

Claim:
A method of forming a structure, comprising: forming on a substrate a precursor dielectric layer of a polymerizable composition comprising one or more polyhedral silsesquioxane oligomers each having one or more polymerizable groups, one or more polymerizable diluents, and (i) one or more photoacid generators, (ii) one or more photoinitiators, or (iii) a mixture of one or more photoacid generators and said one or more photoinitiators; pressing a surface of a template into said precursor dielectric layer, said template having a relief pattern on said surface, said precursor dielectric layer filling voids in said relief pattern; polymerizing said precursor dielectric layer and converting said precursor dielectric layer to a dielectric layer having thick and thin regions corresponding to said relief pattern; removing said template; removing said thin regions of said dielectric layer; either (i) curing said dielectric layer to create a porous dielectric layer followed by filling spaces between said thick regions of said porous dielectric layer with an electrically conductive material or (ii) filling spaces between said thick regions of said dielectric layer with an electrically conductive material followed by curing said dielectric layer to create a porous dielectric layer; wherein said polymerizing said precursor dielectric layer includes exposing said precursor dielectric layer to ultra-violet radiation; wherein said curing is performed at a temperature above about 300° C.; wherein said porous dielectric layer has a dielectric constant less than 3.9; and wherein said filling spaces between said thick regions of said dielectric layer includes either (a) depositing a conformal layer of copper over said dielectric layer, followed by electroplating a plated layer of copper on top of said conformal layer of copper, followed by removing portions of said conformal and plated layers of copper so top surfaces of said conformal and plated layers of copper are coplanar with a top surface of said dielectric layer, or (b) depositing a conformal layer of copper over said porous dielectric layer, followed by electroplating a plated layer of copper on top of said conformal layer of copper, followed by removing portions of said conformal and plated layers of copper so top surfaces of said conformal and plated layers of copper are coplanar with a top surface of said dielectric layer.