First-principles study on the electrical and thermal properties of the semiconducting Sc₃(CN)F₂ MXene

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials called MXenes show great promise for electronic devices.
• Exploring semiconducting MXenes is crucial for advancing 2D electronics.
• Previous MXenes studied, such as Sc3C2F2 and Sc3N2F2, exhibited metallic properties.

Purpose of the Study:

• To investigate the electronic and thermal properties of Sc3(CN)F2.
• To determine if Sc3(CN)F2 exhibits semiconducting behavior.
• To assess the potential of Sc3(CN)F2 for 2D nanoelectronic applications.

Main Methods:

• First-principles calculations were employed to study Sc3(CN)F2.
• Electronic properties, including band gap and carrier mobilities, were analyzed.
• Thermal properties, such as thermal conductivity and specific heat, were calculated.

Main Results:

• Sc3(CN)F2 was identified as a semiconductor with an indirect band gap of 1.18 eV.
• Electron mobilities showed strong anisotropy (1.348 × 10^3 cm^2 V^-1 s^-1 along x, 0.319 × 10^3 cm^2 V^-1 s^-1 along y).
• Hole mobilities exhibited isotropy (0.517 × 10^3 cm^2 V^-1 s^-1 along x, 0.540 × 10^3 cm^2 V^-1 s^-1 along y).
• Room-temperature thermal conductivity ranged from 123-283 W m^-1 K^-1.
• Specific heat was 547 J kg^-1 K^-1, and thermal expansion coefficient was 8.703 × 10^-6 K^-1.

Conclusions:

• Sc3(CN)F2 expands the family of semiconducting MXenes.
• Its anisotropic electron and isotropic hole mobilities are significant for device design.
• The calculated thermal properties suggest suitability for 2D nanoelectronic devices.
• Sc3(CN)F2 is a promising candidate material for future 2D nanoelectronics.