MXene alloy-based metal-semiconductor contact for low-resistive field-effect transistors.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• MXenes possess tunable properties ideal for electronic devices.
• Developing low-resistance contacts is crucial for field-effect transistor performance.

Purpose of the Study:

• To engineer low-resistance metal-semiconductor contacts using MXenes.
• To investigate MXene heterojunctions for field-effect transistor applications.
• To explore strategies for reducing contact resistance in MXene-based devices.

Main Methods:

• First-principles calculations to identify suitable MXene heterojunctions.
• Non-equilibrium Green's function (NEGF) simulations for transport properties.
• Alloy phase engineering to suppress detrimental interfacial effects.

Main Results:

• Identified Ta₂CO₂-Ti₂CO₂ as a promising heterojunction with low Schottky barrier height.
• Demonstrated high output current, indicating low resistance in the Ta₂CO₂-Ti₂CO₂ contact.
• Proposed and validated an interfacial alloying strategy (Ta_2xTi_2(1-x)CO₂) to reduce contact resistance by suppressing metal-induced gap states.

Conclusions:

• MXenes are viable building blocks for advanced electronic devices.
• Interfacial alloying is an effective strategy to engineer high-performance MXene contacts.
• This work provides a computational pathway for designing low-resistance contacts in MXene-based electronics.