Patent ID: 7064088

Claim:
A method for forming a hard film on an insulation film formed on a semiconductor substrate by plasma reaction, comprising the steps of: vaporizing a silicon-containing hydrocarbon compound to provide a source gas, said silicon-containing hydrocarbon compound comprising a cyclic Si-containing hydrocarbon compound and/or a linear Si-containing hydrocarbon compound, as a basal structure, with reactive groups for forming oligomers using the basal structure; introducing a reaction gas comprising the source gas and a carrier gas into a reaction space for plasma CVD processing wherein a semiconductor substrate on which an insulation film is formed is placed; and forming a hard film on the insulation film by activating plasma polymerization reaction using a combination of low-frequency RF power and high-frequency RF power in the reaction space, wherein the plasma polymerization reaction is activated while controlling the flow of the reaction gas to lengthen a residence time, Rt, of the reaction gas in the reaction space, wherein 100 msec≦Rt, Rt[s]= 9.42×10 7 ( Pr·Ts/Ps·Tr ) r w 2 d/F wherein: Pr: reaction space pressure (Pa) Ps: standard atmospheric pressure (Pa) Tr: average temperature of the reaction (K) Ts: standard temperature (K) r w : radius of the silicon substrate (m) d: space between the silicon substrate and the upper electrode (m) F: total flow volume of the reaction gas (sccm).