Patent ID: 8035173

Claim:
A semiconductor structure comprising: a first field effect transistor including: a first high-k dielectric portion vertically abutting a semiconductor substrate; a first metal gate vertically abutting said first high-k dielectric portion; a first silicon containing gate conductor vertically abutting said first metal gate; and an oxide spacer laterally abutting said first metal gate and said first silicon containing gate conductor; and a second field effect transistor including: a second high-k dielectric portion vertically abutting said semiconductor substrate, wherein said first high-k dielectric portion comprises a first dielectric metal oxide containing a metal and said second high-k dielectric portion comprises a second dielectric metal oxide containing the same metal; a second metal gate vertically abutting said second high-k dielectric portion; a second silicon containing gate conductor vertically abutting said second metal gate; and a gate sidewall nitride laterally abutting said second metal gate and said second silicon containing gate conductor, wherein said second high-k dielectric portion is more stoichiometric than said first high-k dielectric portion.