Patent ID: 7943195

Claim:
A chemical vapor deposition method for producing a porous organosilica glass film, said method comprising: providing a substrate within a chamber; introducing into the chamber gaseous reagents comprising: at least one silicon containing precursor having the formula R 1 n (OR 2 ) p (O(O)CR 4 ) 3−n−p Si—R 7 —SiR 3 m (O(O)CR 5 ) q (OR 6 ) 3−m−q where R 1 and R 3 are independently H or C 1 to C 4 linear or branched, saturated, singly or multiply unsaturated, cyclic, partially or fully fluorinated hydrocarbon; R 2 , R 6 and R 7 are independently C 1 to C 6 linear or branched, saturated, singly or multiply unsaturated, cyclic, aromatic, partially or fully fluorinated hydrocarbon, R 4 and R 5 are independently H, C 1 to C 6 linear or branched, saturated, singly or multiply unsaturated, cyclic, aromatic, partially or fully fluorinated hydrocarbon, n is 0 to 3, m is 0 to 3, q is 0 to 3 and p is 0 to 3, provided that n+m≧1, n+p≦3, and m+q≦3 and optionally diethoxymethylsilane; and at least one porogen selected from the group consisting of: (i) at least one bicyclic hydrocarbon having a bicyclic structure and the formula C n H 2n−2 , where n is 4 to 14, a number of carbons in the bicyclic structure is from 4 to 12, and the at least one bicyclic hydrocarbon optionally contains a plurality of simple or branched hydrocarbons substituted onto the bicyclic structure; and (ii) at least one multiply unsaturated bicyclic hydrocarbon having a bicyclic structure and the formula C n H 2n−(2+2x) , where x is a number of unsaturated sites, n is 4 to 14, a number of carbons in the bicyclic structure is from 4 to 12, and the at least one multiply unsaturated bicyclic hydrocarbon optionally contains a plurality of simple or branched hydrocarbons substituents substituted onto the bicyclic structure, and contains endocyclic unsaturation or unsaturation on one of the hydrocarbon substituents; applying energy to the gaseous reagents in the chamber to induce reaction of the gaseous reagents to deposit a preliminary film on the substrate, wherein the preliminary film contains the porogen; and removing from the preliminary film substantially all of the porogen to provide the porous film with pores and a dielectric constant less than 2.6.