Patent ID: 7071116

Claim:
A method for manufacturing a semiconductor device, comprising: forming an aluminum film on a semiconductor substrate by a sputtering process; forming a titanium film on said aluminum film by a sputtering process; forming a titanium nitride film on said titanium film by a sputtering process; forming said aluminum film, said titanium film and said titanium nitride film into predetermined patterns; forming an inter-layer film on said titanium nitride film; forming a photo resist having a predetermined pattern on said inter-layer film; partially exposing said titanium nitride film by partially etching said inter-layer film with said photo resist used as a mask to form a via hole; removing said photo resist; and cleaning an interior of said via hole with a liquid chemical solution, wherein said partially exposing said titanium nitride film includes conducting a first nitrogen plasma process after said partially etching said inter-layer film.