Patent ID: 7582575

Claim:
A method for forming an insulation film on a semiconductor substrate by plasma reaction, comprising: vaporizing a silicon-containing hydrocarbon compound to provide a source gas, said silicon-containing hydrocarbon compound comprising a Si—O bond in a molecule; introducing a reaction gas comprising the source gas and a carrier gas without a separate oxygen-supplying gas into a reaction space for plasma CVD processing wherein a semiconductor substrate is placed; and forming an insulation film constituted by Si, C, O, and H on the substrate by plasma reaction using a combination of low-frequency RF power and high-frequency RF power in the reaction space, wherein the plasma reaction is activated while controlling a 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 semiconductor substrate (m) d: space between the semiconductor substrate and an upper electrode (m) of the reaction space, F: total flow volume of the reaction gas (sccm), wherein said silicon-containing hydrocarbon compound has the formula Si α O α−1 R 2α−β+2 (OR′) β wherein α is an integer of 1-3, β is 0, 1, or 2, R is C 1-6 hydrocarbon attached to Si, and R′ is C 1-6 hydrocarbon unattached to Si, wherein R′ is C n H 2n+1 wherein n is an integer of 1-3, wherein the semiconductor substrate has a via and/or trench wherein the insulation film is formed on a surface of the via and/or trench.