Patent ID: 8124322

Claim:
A method for manufacturing a semiconductor device, comprising: forming, from the bottom, an organic mask layer, an organic silicon oxide layer and a resist layer over an etching-target film provided over a substrate; forming a predetermined pattern in said resist layer by a photolithography process; etching said organic silicon oxide layer through a mask of said resist layer by employing a first etching gas to form a transferred pattern therein that is equivalent to said predetermined pattern; etching said organic mask layer through a mask of said etched organic silicon oxide layer by employing a second etching gas to form a transferred pattern therein that is equivalent to said predetermined pattern; and etching said etching-target film through a mask of said etched organic mask layer by employing a third etching gas to form a transferred pattern therein that is equivalent to said predetermined pattern, wherein said first etching gas contains trifluoroiodomethane (CF 3 I).