Patent ID: 8198162

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) forming a barrier metal film over a first main surface of a wafer having a band-form repeated device pattern region containing an insulated region and an electroconductive region; (b) forming an electrode metal film over the barrier metal film by sputtering, the electrode metal film comprising aluminum as a principal component and having a film thickness of 2.5 μm or more; (c) forming a resist film pattern over the electrode metal film; and (d) patterning the electrode metal film by wet etching in the state that the resist film pattern is present over the electrode metal film, wherein step (b) includes: (b1) forming a seed metal film over the barrier metal film by sputtering; (b2) forming a first electrode metal film over the seed metal film by sputtering at a first deposition rate, the first electrode metal film forming a portion of the electrode metal film; (b3) after substep (b2), forming a second electrode metal film over the first electrode metal film by sputtering at a second deposition rate, the second electrode metal film forming another portion of the electrode metal film, wherein the seed metal film, the first electrode metal film, and the second electrode metal film each comprise aluminum as a principal component, wherein a thickness of the second electrode metal film is greater than a thickness of the first electrode metal film, and wherein the second deposition rate in substep (b3) is less than the first deposition rate in substep (b2).