Patent ID: 6984594

Claim:
A process for vapor depositing a low dielectric insulating film for a semiconductor device comprising the step of vapor depositing an a-SiCOH thin film by a CVD or PECVD method by supplying a reactant gas mixture comprising a gas phase main source, silane (SiH 4 ), and an oxidant to a vapor deposition chamber comprising a substrate, wherein the main source gas is selected as one or more in the group consisting of organosilicon compounds represented by the following Chemical Formulae 1, 2 and 3, wherein the ratio of silane (SiH 4 ) gas to main source gas is 1:0.5 to 1, and wherein the vapor deposition rate of a low dielectric insulating film is 1.006 to 1.266 microns/min: SiH x (CH 3 ) 4−x [Chemical Formula 1] wherein, x is an integer, that is, 0, 1, 2 or 3, Si(OR 1 ) x R 2 4−x [Chemical Formula 2] wherein, R 1 and R 2 are independently or simultaneously straight or branched C1–10 alkyl or alkenyl group substituted or unsubstituted by C1–5 alkyl or alkenyl group, and preferably R 1 and R 2 are independently or simultaneously methyl, ethyl, propyl or vinyl group, and x is an integer from 0 to 4. cyclic-(SiR 1 R 2 —O) n [Chemical Formula 3] wherein, R 1 and R 2 are independently or simultaneously hydrogen, straight or branched C1–10 alkyl or alkenyl group substituted or unsubstituted by C1–5 alkyl or alkenyl group, and preferably R 1 and R 2 are independently or simultaneously hydrogen, methyl, ethyl, propyl or vinyl group.