Patent ID: 7186659

Claim:
An etching method comprising the steps of introducing an etching gas in an etching chamber wherein a material to be etched is placed, and exciting the etching gas to a plasma state to etch the material to be etched, wherein the material to be etched is a metal film laminated on an organic film, and the etching gas is a mixed gas containing at least a gas selected from a group consisting of chlorine (Cl 2 ), boron trichloride (BCl 3 ), and hydrogen bromide (HBr); and at least a gas selected from a group consisting of dichloromethane (CH 2 Cl 2 ), dibromomethane (CH 2 Br 2 ), chloromethane (CH 3 Cl), bromomethane (CH 3 Br), methyl fluoride (CH 3 F), and methane (CH 4 ).