Patent ID: 6563178
Filing Date: 2003-05-13
Classification: H01L

Abstract:
A semiconductor device comprisingan n-channel MOSFET including: a first gate insulating film; and a first gate electrode formed on the first gate insulating film, where the first gate insulating film is deposited on the bottom of a first recessed groove that has been provided for forming the first gate electrode in a dielectric film deposited on a silicon substrate, and a p-channel MOSFET including: a second gate insulating film; and a second gate electrode formed on the second gate insulating film, where the second gate insulating film is deposited on the bottom of a second recessed groove that has been provided for forming the second gate electrode in the dielectric film, wherein the first gate electrode includes: a first metal film, which has been deposited on the first gate insulating film, is made of a first metal or a compound thereof and has a first recess inside the first recessed groove, the first metal having a work function located closer to the conduction band of silicon with reference to an intermediate level of silicon bandgap; a second metal film, which has been deposited on the first metal film, is made of a second metal or a compound thereof and has a second recess inside the first recess, the second metal having a work function located closer to the valence band of silicon with reference to the intermediate level of silicon bandgap; and a first low-resistivity metal film, which is made of a low-resistivity metal and with which the second recess has been filled, and wherein the second gate electrode includes: a third metal film, which has been deposited on the second gate insulating film, is made of the second metal or the compound thereof and has a third recess inside the second recessed groove; and a second low-resistivity metal film, which is made of the low-resistivity metal and with which the third recess has been filled.