Patent ID: 6376888
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A semiconductor device having an N-type MIS transistor formed in a first region and a P-type MIS transistor formed in a second region,wherein, said N-type MIS transistor includes a first gate insulating film formed on at least the bottom of a first concave portion formed in the first region and a first gate electrode formed on said first gate insulating film; said P-type MIS transistor includes a second gate insulating film formed on at least the bottom of a second concave portion formed in the second region and a second gate electrode formed on said second gate insulating film; each of said first and second gate electrodes includes at least one metal-containing film having a metallic property, and at least one of the first and second gate electrodes is of a laminate structure including a plurality of the metal-containing films having a metallic property; and a work function of the metal-containing film having a metallic property constituting at least a part of said first gate electrode and in contact with said first gate insulating film is smaller than a work function of the metal-containing film having a metallic property constituting at least a part of said second gate electrode and in contact with said second gate insulating film.