Reversible Charge-Polarity Control for Multioperation-Mode Transistors Based on van der Waals Heterostructures

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Van der Waals (vdW) heterostructures enable combining unique properties of layered materials for advanced electronic applications.
• Internet-of-things (IoT) applications require multifunctional electronic devices with tunable characteristics.

Purpose of the Study:

• To integrate oxygen (O2)-sensitive MoTe2 and O2-insensitive SnS2 into a vdW heterostructure.
• To achieve dynamic charge-polarity control in transistors for multioperation modes.
• To demonstrate the potential for reversibly multifunctional devices.

Main Methods:

• Fabrication of MoTe2/SnS2 vdW heterostructures.
• Application of rapid thermal annealing under dry-air and vacuum conditions for charge-polarity control.
• Characterization of transistor transfer characteristics and device functionalities.

Main Results:

• The MoTe2/SnS2 heterostructure transistors exhibited reversible switching between unipolar, ambipolar, and anti-ambipolar characteristics.
• Charge-polarity control was achieved through O2 adsorption/desorption interacting with tellurium defects in MoTe2.
• Demonstrated functional devices including an inverter, polarity-controllable amplifier, p-n diode, and ternary-state logic gates (NMIN, NMAX).

Conclusions:

• The developed strategy allows for dynamic control of charge-polarity in 2D material-based transistors.
• This work inspires the development of reversibly multifunctional electronic devices.
• Highlights the potential of 2D materials for advanced IoT applications.