Patent ID: 6339232
Filing Date: 2002-01-15
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate; an n-channel field effect transistor formed on the semiconductor substrate; and a p-channel field effect transistor formed on the semiconductor substrate, the n-channel field effect transistor and the p-channel field effect transistor constituting a complementary field effect transistor, wherein a gate electrode of the n-channel field effect transistor and a gate electrode of the p-channel field effect transistor are made of a same material, wherein a channel region of the n-channel field effect transistor is made of a material which contains at least of Si and in which an energy difference between a conduction band edge and a vacuum level is higher than that of bulk Si, and a channel region of the p-channel field effect transistor is made of a material which contains at least of Si and in which an energy difference between a valence band edge and the vacuum level is lower than that of bulk Si, and wherein a work function of the material making the gate electrodes is higher than the energy difference between the conduction band edge of the material making the channel region of the n-channel field effect transistor and the vacuum level, and is lower than the energy difference between the valence band edge of the material making the channel region of the p-channel field effect transistor and the vacuum level.