Patent ID: 8715791

Claim:
A method for forming a low dielectric porous insulating film, said method comprising: providing a plasma deposition device comprising: a reaction chamber; a vaporization section including a vaporizer; and a mixer formed between the vaporizer and the reaction chamber; heating a transfer pipe which transfers the liquid cyclic organosiloxane raw material and liquid compound raw material to the vaporizer; vaporizing a mixed raw material of a cyclic organosiloxane raw material and a compound raw material that comprises a reaction precursor of the cyclic organosiloxane raw material, in the vaporizer by reducing a pressure at an introduction section of the vaporization section and heating the vaporizer; after the vaporizing of the mixed raw material, mixing the vaporized raw material in a mixer to form a mixed gas of the cyclic organosiloxane raw material and the compound raw material; forming an insulating film by plasma vapor deposition method by supplying the mixed gas from the mixer to the reaction chamber; and before the supplying of the mixed gas from the mixer to the reaction chamber, supplying the compound raw material to the reaction chamber, wherein the vaporizing of the mixed raw material comprises setting a heating temperature in a temperature range from 80° C. to 120° C., wherein the cyclic organosiloxane raw material includes a structure represented by Chemical Formula (4) shown below, wherein the compound raw material includes a structure represented by Chemical Formula (5) shown below, and wherein a mixing ratio of the mixed gas in a vaporized state of the cyclic organosiloxane raw material and the compound raw material is from 5 to 200% by volume for the compound raw material with regard to 100% by volume for the cyclic organosiloxane raw material,