Patent ID: 9484427
Filing Date: 2016-11-01
CPC Classification: H01L

Claim Text:
1. A semiconductor structure comprising: a first gate dielectric straddling a first semiconductor material portion and containing a stack of an adjustment oxide layer including a silicate of a metal selected from alkaline earth metals, Group IIIB elements, and rare earth metals and a first high dielectric constant (high-k) gate dielectric including a dielectric metal oxide and having a dielectric constant greater than 8.0; a first gate electrode in contact with said first gate dielectric and containing a first metallic material layer in contact with said first high-k gate dielectric; a second gate dielectric straddling a second semiconductor material portion and containing a stack of a semiconductor oxide layer and a second high-k gate dielectric, wherein said first high-k gate dielectric differs in composition from said second high-k gate dielectric by presence of oxygen deficiency in said first high-k gate dielectric; and a second gate electrode in contact with said second gate dielectric and containing a second metallic material layer in contact with said second high-k gate dielectric.