Low voltage and high ON/OFF ratio field-effect transistors based on CVD MoS₂and ultra high-k gate dielectric PZT

MoS2and other atomic-level thick layered materials have been shown to have a high potential for outperforming Si transistors at the scaling limit. In this work, we demonstrate a MoS2transistor with a low voltage and high ON/OFF ratio. A record small equivalent oxide thickness of ∼1.1 nm has been obtained by using ultra high-k gate dielectric Pb(Zr0.52Ti0.48)O3. The low threshold voltage (<0.5 V) is comparable to that of the liquid/gel gated MoS2transistor. The small sub-threshold swing of 85.9 mV dec-1, the high ON/OFF ratio of ∼108and the negligible hysteresis ensure a high performance of the MoS2transistor operating at 1 V. The extracted field-effect mobility of 1-10 cm2V-1s-1suggests a high crystalline quality of the CVD-grown MoS2flakes. The combination of the two-dimensional layered semiconductor and the ultra high-k dielectric may enable the development of low-power electronic applications. This journal is