On Relationships between Plasma Chemistry and Surface Reaction Kinetics Providing the Etching of Silicon in CF(4), CHF(3), and C(4)F(8) Gases Mixed with Oxygen

In this work, we discuss the effects of component ratios on plasma characteristics, chemistry of active species, and silicon etching kinetics in CF(4) + O(2), CHF(3) + O(2), and C(4)F(8) + O(2) gas mixtures. It was shown that the addition of O(2) changes electrons- and ions-related plasma parameters rapidly suppresses densities of CF(x) radicals and influences F atoms kinetics through their formation rate and/or loss frequency. The dominant Si etching mechanism in all three cases is the chemical interaction with F atoms featured by the nonconstant reaction probability. The latter reflects both the remaining amount of fluorocarbon polymer and oxidation of silicon surface.