Patent ID: 7964442

Claim:
A method for processing a semiconductor substrate, comprising: flowing a precursor to a processing chamber, wherein the precursor comprises a mixture of an organosilicon compound and a hydrocarbon compound, the organosilicon compound comprises silicon-carbon bonds and carbon-carbon bonds, and the hydrocarbon compound comprises carbon-carbon bonds, and wherein the precursor comprises a double carbon-carbon bond (C═C) source or a triple carbon-carbon bond (C≡C) source; generating a low density plasma of the precursor in the processing chamber to form a dielectric barrier film having carbon-carbon bonds on the semiconductor substrate, wherein at least a portion of the carbon-carbon bonds in the precursor is preserved in the low density plasma and incorporated in the dielectric barrier film, and the dielectric barrier film does not contain Si—O bonds; and introducing a controlled amount of a nitrogen source to eliminate double carbon-carbon (C═C) bonds or triple carbon-carbon (C≡C) bonds from the dielectric barrier film.