Patent ID: 6649500
Filing Date: 2003-11-18
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device including an insulated gate field effect transistor (IGFET), comprising the steps of:forming a gate insulating film on a semiconductor substrate; forming a laminate film on the gate insulating film, the laminate film including an insulating film formed on a second conductive film formed on a first conductive film; etching the insulating film and second conductive film into a predetermined pattern to form a cap layer and an upper layer gate electrode; forming a first nitride film, that is a thermal nitride film, on the side surface of the upper layer gate electrode; etching the first conductive film using the cap layer, upper layer gate electrode, and the nitride film as a mask to form a lower layer gate electrode; forming a first oxide film on the side surface of the lower layer electrode; and forming an etching stopper film including a second nitride film over the entire surface.