Patent ID: 7288292

Claim:
A method of forming a multiphase, ultra low dielectric constant film comprising: positioning a substrate in a plasma enhanced chemical vapor deposition (PECVD) reactor; flowing a cyclic siloxane first precursor gas into the reactor; flowing a second precursor gas comprising organic molecules containing mainly atoms of C and H into the reactor; flowing a third precursor gas into the reactor, said third precursor gas selected from the group consisting of tetramethylorthosilicate (TMOS), tetraethylorthosilicate (TEOS), vinyltriethoxysilane, allyltrimethoxysilane, vinyltrimethoxysilane, allyltriethoxysilane, phenyltriethoxysilane and phenyltrimethoxysilane; and depositing a multiphase, ultra low k film having a dielectric constant of about 2.7 or less, said multiphase, ultra low k film containing tetrahedral Si—O bonding and a first phase of hydrogenated oxidized silicon carbon material consisting of Si, C, O and H atoms in a covalently bonded network structure and at least another phase consisting essentially of C and H atoms.