Patent ID: 6908801
Filing Date: 2005-06-21
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a gate insulating film on a semiconductor substrate having first and second element regions; forming a mask having an etching selectivity to the gate insulating film on an entire surface of the gate insulating film; selectively etching the mask to form an opening for exposing a portion of the gate insulating film, which is positioned in the first element region; forming a first conductive material film on an entire surface of the mask including the hole; patterning the first conductive material film to form a patterned first conductive material film on the portion of the gate insulating film, which is positioned in the first element region, and to expose the mask; etching away the exposed mask; forming a second conductive material having a work function different from that of the first conductive material film on the gate insulating film including the patterned first conductive material film to cover a portion of the gate insulating film, which is positioned in the second element region, with the second conductive material film; and forming a first gate electrode having the first conductive material film on the gate insulating film in the first element region, and a second gate electrode made of the second conductive material film on the gate insulating film in the second element region.