Patent ID: 7432207

Claim:
A method for etching an object to be processed, comprising: receiving the object in a processing chamber, the object including an SiC portion and an organic Si-based low dielectric constant film, prepared on the SiC portion, serving as an insulating film; etching the organic Si-based low dielectric constant film by using a resist layer as a mask to provide a patterned organic Si-based low dielectric constant film, the resist film being disposed directly on the organic Si-based low dielectric constant film; supplying an etching gas into the processing chamber while converting the etching gas into a plasma, the etching gas including CH 2 F 2 , O 2 and Ar; and etching the SiC portion by the plasma of the etching gas by using the patterned organic Si-based low dielectric constant film as a mask, wherein the ratio of (a flow rate of Ar)/(a sum of flow rates of CH 2 F 2 and O 2 ) in the etching gas is equal to or less than 15, and the mask employed in etching the SiC portion consists essentially of the patterned organic Si-based low dielectric constant film.