Patent ID: 7087969
Filing Date: 2006-08-08
Classification: H01L

Abstract:
1. A complementary field effect transistor comprising: semiconductor substrate; an n-type field effect transistor provided on the semiconductor substrate having: a first gate insulating film containing an oxide including an element selected from the group consisting of group IV metals and Lanthanoid metals, and further containing a compound of the element and boron; a first gate electrode provided on the first gate insulating film; and n-type source and drain regions formed on both sides of the first gate electrode; and a p-type field effect transistor provided on the semiconductor substrate having: a second gate insulating film containing an oxide including an element selected from the group consisting of group IV metals and Lanthanoid metals, and substantially containing no boron; a second gate electrode provided on the second gate insulating film; and p-type source and drain regions provided on both sides of the second gate electrode.