Patent ID: 8177990

Claim:
An etching method comprising: providing a substrate having thereon a Si 0 2 film, an organic film, a coating film, and a photoresist film stacked in that order, the photoresist film having openings through which the coating film is exposed; forming plasma of a first gas comprising Ar gas and CH 4 gas, thereby depositing a single-layer deposition film, comprising carbon and hydrogen, on the photoresist film in such a way that thickness of the photoresist film increases, that size of the openings is reduced, and that the single-layer deposition film is not deposited on the coating film, wherein the depositing of the single-layer deposition film on the photoresist film is conducted only once; and forming plasma of a second gas containing carbon and fluorine, thereby etching the coating film by using the photoresist film and the single-layer deposition film as an etch mask, wherein the etching of the coating film is performed directly after the depositing of the single-layer deposition film, the coating film is a spin-on-glass film, and the first gas fails to include fluorine, and the single-layer deposition film fails to include fluorine.