Dual metal gate FinFET integration by Ta/Mo diffusion technology for Vt reduction and multi-Vt CMOS application

Dual metal gate CMOS FinFETs have been integrated successfully by the Ta/Mo interdiffusion technology. For the first time, low-Vt CMOS FinFETs representing on-current enhancement and high-Vt CMOS FinFETs reducing stand-by power dramatically, namely multi-Vt CMOS FinFETs, are demonstrated by selecting Ta/Mo gates for n or pMOS FinFETs with non-doped fin channels. The dual metal gate FinFET SRAM with a low-Vt configuration is demonstrated with excellent noise margins at a reduced supply voltage.