Patent ID: 7306853

Claim:
A method of forming a patterned interconnect structure comprising: (a) providing a structure including a cap layer atop a substrate; (b) applying a patternable low-k composition comprising a functionalized polymer having one or more acid-sensitive imageable groups, wherein said functional polymer has a dielectric constant of less than 3.9 and said functionalized polymer is a caged silsesquioxane polymer including combinations thereof having the formula: wherein each occurrence of R 1 is independently one or more acidic functional groups for base solubility; each occurrence of R 2 independently comprises at least one acid-sensitive imageable functional group for crosslinking; R 1 is not equal to R 2 ; m and n represent the number of repeating units; m is an integer; and n is zero or an integer greater than zero, wherein said acid-sensitive imageable functional group for crosslinking is selected from a linear or branched alkyl that is substituted with at least one of —OH, epoxide, and —F; a cycloalkyl which is substituted wit at least one of —OH, epoxide, and —F; a cyclo aromatic that is substituted with at least one of —OH, epoxide, and —F; or an arene that is substituted with at least one of —OH, epoxide, and —F onto said cap layer; (c) forming via and/or line patterns in said paternable low-k composition; (d) curing said patternable low-k composition to convert said composition into a patternable low-k material; and (e) filling said via/or line patterns with at least a conductive material.