Patent ID: 7105438
Filing Date: 2006-09-12
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device, comprising: forming a metallic gate electrode film, a protective film and an offset nitride film sequentially on a semiconductor substrate to compose a stacked structure; covering the stacked structure and the semiconductor substrate with an insulating film; etching the insulating film to expose the offset nitride film; etching the exposed offset nitride film to expose the protective film; etching the exposed protective film to expose the metallic gate electrode film under predetermined etching conditions, wherein an etching rate of the protective film is greater than an etching rate of the metallic gate electrode film, wherein a same etching mask is used during said etching the insulating film, said etching the exposed offset nitride film and said etching the exposed protective film, to form a contact hole; and forming a conductive plug in the contact hole.