Patent ID: 7300882

Claim:
A semiconductor device fabricating method comprising the steps of: forming a first interconnection; forming a low-k film as an interlayer insulating film over the first interconnection; forming a contact hole for electrically connecting the first interconnection and a second interconnection, in the interlayer insulating film comprising the low-k film; and forming an interconnection groove for embedding the second interconnection in the interlayer insulating film comprising the low-k film, wherein, in at least one of the hole forming step and the interconnection groove forming step, plasma etching is conducted under a gas atmosphere including a fluorocarbon gas, O 2 gas and Ar gas, and under the conditions of a pressure of 60 mTorr (7999.32 mPa) or higher and a high-frequency output (RF power) of 600 W or less, and wherein an etch stop layer is not formed in the interlayer insulating film comprising the low-k film.