Dielectric Response of Hydrogenated Borophene Monolayers from First-Principles Density Functional Theory Calculations

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Two-dimensional (2D) materials are crucial for advanced technologies.
• Hydrogenated borophene (borophane) shows potential in electronics, optoelectronics, and catalysis.
• Understanding borophane's properties is key for material design.

Purpose of the Study:

• To systematically investigate the structural, electronic, and optical properties of 6,6 and 5,7 borophane polymorphs.
• To explore the influence of symmetry and hydrogenation on borophane's characteristics.
• To provide insights for designing novel boron-based 2D materials.

Main Methods:

• Density Functional Theory (DFT) calculations.
• Analysis of electronic band structures and density of states.
• Calculation of complex dielectric function spectra.

Main Results:

• All investigated borophane structures exhibit semimetallic characteristics.
• Structural motifs and hydrogenation patterns tune optical absorption onset.
• 5,7 borophane shows a shift towards the far-infrared region, indicating enhanced low-energy electronic response.

Conclusions:

• Symmetry and bonding topologies fundamentally govern borophane's electronic and optical behavior.
• Borophane's properties can be tailored for specific optoelectronic applications.
• This study offers guidance for developing advanced boron-based 2D materials.