Patent ID: 8080282

Claim:
A method for forming a silicon carbide film containing Si, C, O, H, and optionally N on a substrate placed in a reaction space, comprising: introducing into the reaction space a precursor gas containing Si, C, O, and H and having at least one Si—O bond in its molecule, the precursor is selected from the group consisting of dimethyldimethoxysilane (DMDMOS), diethyldiethoxysilane (DEDEOS), phenyltrimethoxysilane (PTMOS), 1,3-dimethoxytetramethyl disilane (DMOTMDS), and hexamethydisilane (HMDS); introducing into the reaction space an inert gas independently of the precursor gas, said inert gas being selected from the group consisting of He, Ar, Kr, and Xe; applying RF power in the reaction space to form a silicon carbide film containing Si, C, O, H, and optionally N; and adjusting a ratio of a flow rate (sccm) of the inert gas to the RF power density (W/cm 2 ) as a parameter in a range of 200 to 550 so as to form a silicon carbide film having a dielectric constant of 3.5 to 3.98 and a density of higher than 1.5 g/cm 3 but less than 2.4 g/cm 3 .