Patent ID: 8994125
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A semiconductor device including a transistor formed on a semiconductor substrate, comprising: a gate insulating film formed on the semiconductor substrate; a first conductive film being a metal film, a metal nitride film, a metal silicide film or a metal carbide film, and formed on and in contact with the gate insulating film; a middle layer formed on an upper surface of the first conductive film and in contact with the first conductive film and containing a silicon material, the middle layer being separated from the gate insulating film by the first conductive film; a second conductive film, comprising of different aterial from the middle layer, formed on an upper surface of the first conductive film and in contact with the first conductive film and in contact with a sidewall of the middle layer, and the first conductive film has a different chemical composition from the second conductive film.