Metal gate and high-k dielectric device having a PFET channel SiGe

摘要

Fabricating of semiconductor devices includes: depositing epitaxially a SiGe layer onto both NFET and PFET portions of a Si surface; blanket disposing a first sequence of layers over the SiGe layer including a high-k dielectric and a metal, incorporating the first sequence of layers into the gatestacks and gate insulators of both NFET devices and PFET devices; the first sequence of layers is selected to yield desired device parameter values for the PFET devices; removing the gatestack, the gate dielectric, and the SiGe layer for the NFET devices, re-forming the NFET devices by deploying a second sequence of layers that include a second high-k dielectric and a second metal; the second sequence of layers is selected to yield desired device parameter values for the NFET devices.