Patent ID: 7439177

Claim:
A method of manufacturing a semiconductor device comprising the steps of: forming a metal film on a semiconductor substrate; forming a high-temperature amorphous carbon film pattern on the metal film for defining a wiring forming area; etching the metal film by using the high-temperature amorphous carbon film pattern as an etching barrier to form a metal wiring; forming a low-temperature amorphous carbon film as an IMD on an entire surface of a resultant structure such that the low-temperature amorphous carbon film is filled to cover the etched portion of the metal wiring and the high-temperature amorphous carbon film pattern formed on the metal wiring; etching the low-temperature amorphous carbon film and the high-temperature amorphous carbon film pattern to form a contact hole on the metal wiring, which has greater width in an upper portion bounded by the low-temperature amorphous carbon film than in a lower portion thereof bounded by the high-temperature amorphous carbon film, and through which contact hole the metal wiring is exposed; and forming a plug metal film such that the contact hole is filled with the plug metal film.