Patent ID: 7732339

Claim:
An etching method, comprising the steps of: depositing an organic/inorganic hybrid film on a substrate; forming a silicon oxide film containing no carbon component on a surface of the organic/inorganic hybrid film; and plasma-etching the organic/inorganic hybrid film and the silicon oxide film, wherein the organic/inorganic hybrid film is deposited on the substrate by CVD using a material gas composed of organic silicon containing siloxane having at least one methyl group, has low dielectric constant, and is represented by SiCxHyOz (x>0, y≧0, z>0), wherein the step of plasma-etching is performed with a gas containing fluorine, carbon and nitrogen, and wherein the step of forming a silicon oxide film includes forming the silicon oxide film by eliminating a carbon component from a surface portion of the organic/inorganic hybrid film.