Reversible and Precisely Controllable p/n-Type Doping of MoTe₂ Transistors through Electrothermal Doping

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Molybdenum ditelluride (MoTe2) is a promising 2D material for advanced electronic devices.
• Achieving controllable and reversible p/n-type doping in MoTe2 is crucial for developing functional circuits.
• Existing doping methods can be complex or introduce unwanted impurities.

Purpose of the Study:

• To develop a simple, efficient, and controllable method for p/n-type doping of MoTe2 transistors.
• To investigate the mechanism behind electrothermal doping (E-doping) in MoTe2.
• To demonstrate the fabrication of logic circuits using E-doped MoTe2 transistors.

Main Methods:

• Electrothermal annealing in a vacuum chamber under an electric field for n-type doping.
• Exposure to air (oxygen/water vapor) for p-type doping.
• Fabrication of quasi-complementary metal oxide semiconductor adaptive logic circuits.

Main Results:

• Precisely controllable and reversible p/n-type doping of MoTe2 transistors was achieved via E-doping.
• The doping mechanism involves the interaction of oxygen/water vapor with tellurium defects at the MoTe2 surface.
• Successfully fabricated logic circuits including inverters, NOT OR gates, and NOT AND gates.

Conclusions:

• E-doping is a simple, efficient, and dopant-free method for achieving p/n-type doping in MoTe2.
• This technique allows for accurate manipulation of MoTe2 transistor doping for electronic device applications.
• E-doping provides a viable approach for creating electronic devices with tailored performance characteristics.