Cryogenic Characterization of Nano-scale Bulk FinFETs

For the state-of-art quantum technology applications, the effective control and high-speed reading of a large number of qubits require a combination of complementary metal-oxide-semiconductor (CMOS) circuits in cryogenic temperatures environments. In this letter, the electrical responses of bulk fin field effect transistor (FinFET) devices that could be applied in quantum controllers have been investigated under cryogenic conditions. The devices under test are high-k metal gate bulk FinFETs with 35 nm channel length. The electrical properties of the FinFET device are greatly optimized at cryogenic temperatures. As the temperature decreases, the FinFET exhibits a larger saturation current, smaller subthreshold swing, larger maximum transconductance, and smaller gate-induced drain leakage current. These results provide experimental evidence for the implementation of the FinFET in control systems for quantum chips in cryogenic environments.