Patent ID: 8647980

Claim:
A method of forming wiring, comprising: depositing a metal thin film that contains Cu on a base member; forming a metal film that does not contain Cu on the metal thin film; patterning a photoresist by photolithography on the metal film that does not contain Cu; etching the metal film that does not contain Cu by isotropic dry etching using the photoresist as an etching mask; and forming metal wiring by removing the photoresist after the metal film that does not contain Cu is etched, and etching the metal thin film by isotropic wet etching using the metal film that does not contain Cu as an etching mask so as to partially remove the metal thin film, wherein the metal film that does not contain Cu is formed by using molybdenum, tungsten, chrome, molybdenum nitride, titanium nitride, or tungsten nitride as a material thereof.