Patent ID: 7892914
Filing Date: 2011-02-22
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming an insulating film on an entire surface of a substrate having a device isolation region and a first and a second conductive region; forming a semiconductor device structure having a gate electrode forming region on each of the conductive regions, the insulating film being disposed between the gate electrode forming region and each of the conductive regions; forming a gate electrode groove in the gate electrode forming region of the semiconductor device structure, wherein the insulating film is removed in the gate electrode groove; depositing a gate insulating film and a film of metal gate electrode material on a bottom surface and a side surface of the gate electrode groove; and forming an alloy by alloying the film of metal gate electrode material deposited in a gate electrode groove of the first conductive region, wherein in the step of forming the alloy, an alloy forming material film is deposited on the film of metal gate electrode material, and the film of metal gate electrode material is alloyed with the alloy forming material film, and wherein the step of forming the alloy includes the steps of: depositing a reaction prevention film on the film of metal gate electrode material; removing the reaction prevention film of the first conductive region by etching; and then forming the alloy by depositing the alloy forming material film and then performing a heat treatment.