Patent ID: 7915180

Claim:
A method of fabricating a SiCOH dielectric material comprising forming a preliminary dielectric film containing at least one organosilicon precursor with a built-in sacrificial organic porogen on a surface of a substrate from a vapor or liquid phase, said at least one organosilicon precursor containing the built-in sacrificial organic porogen is selected from silane (SiH 4 ) derivatives having the molecular formula SiR*R 1 R 2 R 3 , disiloxane derivatives having the molecular formula R*R 5 R 6 Si—O—Si—R 7 R 8 R 9 , trisiloxane derivatives having the molecular formula R*R 11 R 12 —Si—O—Si—R 13 R 14 —O—Si—R 15 R 16 R 17 and disilaalkane derivatives having the molecular formula R*R 5 R 6 Si—(CH 2 ) n —Si—R 7 R 8 R 9 , where n is 1-2, R* is a sacrificial porogen group and R 1-17 , which may or may not be identical, are selected from H, alkyl, alkoxy, epoxy, phenyl, vinyl, allyl, alkenyl or alkynyl groups that may be linear, branched, cyclic, polycyclic and may be functionalized with oxygen, nitrogen or fluorine containing substituents; and performing an energetic treatment step on said preliminary dielectric film to substantially remove said built-in sacrificial organic porogen from said preliminary dielectric film providing a porous dielectric film comprising atoms of Si, C, H and O that has a dielectric constant of about 2.7 or less and a uniform and narrow and uniform pore size distribution.