Patent ID: 7470633

Claim:
A method of forming a hydrocarbon-containing polymer film on a semiconductor substrate by a capacitively-coupled plasma CVD apparatus, which comprises: introducing a hydrocarbon-containing liquid monomer (C α H β X γ , wherein α and β are natural numbers of 5 or more; γ is an integer including zero; X is O, N or F) having a boiling point of about 20° C. to about 350° C. and having no benzene structure, into a heater to vaporize the liquid monomer, wherein said non-benzene liquid monomer is flow-controlled upstream of said heater by a flow control valve, and its introduction into said heater is blocked, except when the formation of a hydrocarbon-containing polymer film is ongoing, by a shutoff valve disposed between said flow control valve and said heater and kept approximately at 50° C. or lower; introducing said vaporized gas into a CVD reaction chamber inside which a substrate is placed; and forming a hydrocarbon-containing polymer film on said substrate by plasma polymerization of said gas.