High gain, low noise, fully complementary logic inverter based on bi-layer WSe2 field effect transistors

In this article, first, we show that by contact work function engineering, electrostatic doping and proper scaling of both the oxide thickness and the flake thickness, high performance p- and n-type WSe2 field effect transistors (FETs) can be realized. We report record high drive current of 98 mu A/mu m for the electron conduction and 110 mu A/mu m for the hole conduction in Schottky barrier WSe2 FETs. Then, we combine high performance WSe2 PFET with WSe2 NFET in double gated transistor geometry to demonstrate a fully complementary logic inverter. We also show that by adjusting the threshold voltages for the NFET and the PFET, the gain and the noise margin of the inverter can be significantly enhanced. The maximum gain of our chemical doping free WSe2 inverter was found to be similar to 25 and the noise margin was close to its ideal value of similar to 2.5V for a supply voltage of V-DD = 5.0 V. (C) 2014 AIP Publishing LLC.