Patent ID: 7381599
Filing Date: 2008-06-03
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising the steps of: forming a semiconductor film comprising silicon over a substrate, said semiconductor film including at least a first region to become a high resistance region and a second region to become a drain region adjacent to said high resistance region; forming a gate insulating film over the semiconductor film; forming a gate electrode over the semiconductor film with the gate insulating film interposed therebetween wherein said second region of said semiconductor film is exposed from said gate insulating film; forming a metal film to cover said semiconductor film, said gate insulating film and said gate electrode wherein said metal film contacts the second region of said semiconductor film so that a metal silicide layer is formed by a reaction between said metal film and the second region of said semiconductor film; forming said high resistance region by adding an impurity to said first region for giving one conductivity type at a first concentration after forming the metal silicide layer; and forming said drain region by adding an impurity to said second region for giving said one conductivity type at a second concentration higher than said first concentration after forming the metal silicide layer, wherein said metal silicide layer is not formed on the first region.