Patent ID: 8143175

Claim:
A dry etching method for forming a wiring using a plasma etching apparatus, by etching a material to be etched using a mask pattern having a mask pattern dimension and being composed of a photoresist and an inorganic film disposed on the material to be etched, the method comprising: a step of etching the inorganic film using the photoresist as a mask pattern for etching the inorganic film; a step of etching the material to be etched using a mixed gas composed of a halogen-based gas, at least one fluorine-containing gas selected from a group consisting of CF 4 , CHF 3 , SF 6 , and NF 3 , and O 2 gas, until the inorganic film to which etching is performed is reduced to a desired mask pattern dimension; and a step of etching a remainder of the material to be etched to which etching is performed, using the inorganic film reduced to the desired mask pattern dimension as the mask pattern.