Patent ID: 8383519

Claim:
An etching method by which a fluorine-added carbon film of a structure in which a copper (Cu) wiring layer and the fluorine-added carbon film are sequentially formed on a semiconductor substrate, is etched, the etching method comprising: performing first etching on the fluorine-added carbon film by using an etching mask; forming a silicon-based coating film on the fluorine-added carbon film to fill an etched portion of the fluorine-added carbon film after the first etching is performed; forming an etching mask on the silicon-based coating film and performing second etching on the fluorine-added carbon film by using the etching mask; and removing the silicon-based coating film, wherein the above operations are performed so that trenches and vias that reach a position corresponding to the Cu wiring layer are formed in the fluorine-added carbon film, and wherein the first etching and the second etching each comprise: a first step of etching the fluorine-added carbon film with plasma of an oxygen-containing processing gas; and a second step of etching the fluorine-added carbon film with plasma of a fluorine-containing processing gas.