Abstract: A method of forming a hydrocarbon-containing polymer film on a semiconductor substrate by a capacitively-coupled plasma CVD apparatus. The method includes the steps of: vaporizing a hydrocarbon-containing liquid monomer (C?H?X?, wherein ? and ? are natural numbers of 5 or more; ? is an integer including zero; X is O, N or F) having a boiling point of about 20° C. to about 350° C. which is not substituted by a vinyl group or an acetylene group; introducing the vaporized gas and CO2 gas or H2 gas into a CVD reaction chamber inside which a substrate is placed; and forming a hydrocarbon-containing polymer film on the substrate by plasma polymerization of the gas, thereby reducing extinction coefficient (k) at 193 nm and increasing mechanical hardness.

Abstract: A plasma CVD apparatus for forming a thin film on a wafer having diameter Dw and thickness Tw, includes: a vacuum chamber; a shower plate; a top plate; a top mask portion for covering a top surface peripheral portion of the wafer; and a side mask portion for covering a side surface portion of the wafer. The side mask portion has an inner diameter of Dw+?, and the top mask portion is disposed at a clearance of Tw+? between a bottom surface of the top mask portion and a wafer-supporting surface of the top plate, wherein ? is more than zero, and ? is more than zero.