Patent ID: 8097534

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: preparing a substrate provided with an etching-target film thereon and a multi-layered resist on the etching-target film, including an organic film and a resist film developed into a resist pattern; and forming the organic film of the multi-layered resist into a mask pattern by etching the organic film through the resist pattern of the resist film wherein plasma obtained by exciting a process gas containing carbon dioxide and hydrogen to the plasma state is used to etch the organic film and the mask pattern of the organic film is to be used in etching the etching-target film, wherein a low dielectric constant film which has a recess and contains silicon, carbon, oxygen, and hydrogen is formed between the multi-layered resist and the etching-target film on the substrate and the organic film of the multi-layered resist is buried in the recess of the low dielectric constant film.