Methods for forming metal lines in semiconductor devices are disclosed. One example method may include forming a lower adhesive layer on a semiconductor substrate; forming a metal layer including aluminum on the lower adhesive layer; forming an anti-reflection layer on the metal layer; forming a photomask on the anti-reflection layer; performing an initial etching, a main etching and an over-etching for the anti-reflection layer, the metal layer and the lower adhesive layer, respectively, in a region which is not protected by the photomask, using C.sub.3F.sub.8 as a main etching gas; and removing the photomask residual on the anti-reflection layer.
Disclosed herein is a method of forming metal wirings for high voltage elements. According to the present invention, after a copper film is formed, a wet etch process using an interlayer insulating film as an etch mask is performed to pattern the copper film. It is thus possible to form copper wirings for high voltage elements the width of which is very wide. Furthermore, a wet etch process using a chemical aqueous solution is performed instead of a copper polishing process. The cost for forming a metal wiring can be thus saved. Moreover, by controlling a wet etch time, the space between metal wirings, which is narrower than a width of the metal wiring, can be secured sufficiently.
