Patent ID: 8227323

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: forming semiconductor function regions and insulating film patterns on a main surface side of a semiconductor substrate, the insulating film patterns including required contact holes; and forming an aluminum film or an aluminum alloy film with a film thickness of 0.5 μm or more all over the main surface side of the semiconductor substrate, and bringing the aluminum film or the aluminum alloy film into conductive contact with the semiconductor substrate surface including bottom surfaces of the contact holes so as to form an electrode film; wherein: the step of forming the aluminum film or the aluminum alloy film is divided into a plurality of steps to form the thickness of the aluminum film or the aluminum alloy film gradually; and after each step of forming the aluminum film or the aluminum alloy film, there is a step of performing isotropic etching to flatten irregularities in a surface of the aluminum film or the aluminum alloy film.