Designing 2D Wide Bandgap Semiconductor B₁₂X₂H₆ (X=O, S) Based on Aromatic Icosahedral B₁₂

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Two-dimensional (2D) materials are crucial for next-generation electronics.
• Superatoms offer a novel building block approach for designing 2D materials.
• Boron-based materials, particularly those utilizing B12 clusters, are of significant interest.

Purpose of the Study:

• To predict and characterize novel 2D boride materials using B12 superatoms.
• To investigate the structural stability, electronic properties, and carrier mobilities of the predicted materials.
• To assess the potential of these materials for applications in low-dimensional electronics and energy storage.

Main Methods:

• First-principles calculations were employed to predict the material structures.
• Ab initio molecular dynamics simulations were used to assess thermal stability.
• Electronic structure calculations determined bandgaps and semiconductor properties.
• Deformation potential theory was applied to calculate carrier mobilities.

Main Results:

• Two novel 2D borides, B12O2H6 and B12S2H6, were successfully predicted with B12 icosahedral units.
• Both materials exhibit exceptional structural stability up to 2200 K.
• They are wide-bandgap indirect semiconductors with bandgaps of 4.92 eV (B12O2H6) and 5.25 eV (B12S2H6).
• High phonon-limited carrier mobilities were predicted (up to 1469 cm2V-1s-1 for B12O2H6).
• Excellent alkali metal ion migration performance was observed on their surfaces.

Conclusions:

• The study expands the family of 2D materials derived from B12 superatoms.
• B12O2H6 and B12S2H6 are promising candidates for low-dimensional electronic applications due to their stability and electronic properties.
• Their surface properties suggest potential use in energy storage devices, such as batteries.