Patent ID: 7169708

Claim:
A method of making a semiconductor device comprising: forming on or above a substrate an insulative film with a low dielectric constant, wherein said low dielectric constant insulative film is any one of a low dielectric constant insulator film containing Si, C, O and H or an organic hydrocarbon polymer-based low dielectric constant insulator film, each said insulator film having a dielectric constant of less than or equal to three; forming a hard mask film on the low dielectric constant insulative film; forming on a surface of said hard mask film a resist pattern through deposition and development of a resist film; etching said hard mask film with said resist pattern as a mask to thereby form a hard mask; removing said resist pattern by an ashing treatment; and etching said low dielectric constant insulative film by use of said hard mask to thereby form a pattern, wherein during the ashing of said resist pattern, the resist is stripped away by using a mixture gas of hydrogen (H2) and helium (He).