Patent ID: 6979634
Filing Date: 2005-12-27
Classification: H01L

Abstract:
1. A semiconductor device manufacturing method comprising a step of siliciding a polysilicon gate, the method comprising steps of: forming first polysilicon serving as a gate on a semiconductor substrate; forming a first insulating film on said semiconductor substrate to cover said first polysilicon, to be thicker than said first polysilicon and to leave a difference in height around said first polysilicon; forming said first insulating film to be thinner than said first polysilicon by etching back using a dry etching method on a whole surface thereof after the step of forming said first insulating film to be thicker than said first polysilicon; forming a second insulating film on said whole surface of said first insulating film to have such a thickness as to flatten a difference in height near said first polysilicon; selectively etching said second insulating film by an etch back method until said first insulating film located on an upper surface of said gate is exposed; selectively etching said first insulating film located on the upper surface of said gate until the upper surface of said gate is exposed; burying a space in which said first insulating film is etched, and forming second polysilicon on said second insulating film; etching said second polysilicon, exposing said second insulating film, and leaving said second polysilicon in said space; etching said second insulating film; etching said first insulating film; forming high melting point metal covering said second polysilicon; siliciding said second polysilicon by a heat treatment; and removing an unreacted portion of said high melting point metal.