Patent ID: 8802527
Filing Date: 2014-08-12
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a semiconductor substrate comprising a semiconductor material; a gate dielectric comprising a high dielectric constant (high-k) dielectric layer having a dielectric constant greater than 7.5 and located over said semiconductor substrate; and a gate electrode contacting said gate dielectric and containing a stack, from bottom to top, of a polycrystalline semiconductor material layer in contact with said gate dielectric, a metallic compound layer including a metallic compound, and a scavenging-metal-containing layer including at least one scavenging metal, wherein said at least one scavenging metal in said scavenging-metal containing layer is in an elemental form or in a metallic non-metal-element-containing compound including said at least one scavenging metal, at least one elemental metal selected from the group consisting of Ti and Ta, and at least one non-metal element.