Patent ID: 9029959
Filing Date: 2015-05-12
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a first field effect transistor having a first gate dielectric, said first gate dielectric comprising a first doped high dielectric constant (high-k) gate dielectric, which comprises a first high-k dielectric material having a dielectric constant greater than 3.9 and doped with a first dopant metal, and a first undoped high-k gate dielectric, which comprises a second high-k gate dielectric material selected from the group consisting of HfO a second field effect transistor having a second gate dielectric, said second gate dielectric comprising a second doped high-k gate dielectric, which comprises said first high-k dielectric material and doped with a second dopant metal that is different from said first dopant metal, and a second undoped high-k gate dielectric, which comprises said second high-k gate dielectric material selected from the group consisting of HfO