A theoretical study of several fully hydrogenated borophenes.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Two-dimensional borophene monolayers are typically metallic and structurally unstable.
• Exploring novel physical properties of borophenes remains an active research area.

Purpose of the Study:

• To investigate the structural, mechanical, and electronic properties of four fully hydrogenated borophenes (β12, δ3, δ5, and α).
• To identify stable borophene phases and assess their potential for applications.

Main Methods:

• First-principles calculations were employed.
• Phonon dispersion relations and ab initio molecular dynamics simulations were used to assess stability.
• HSE06 calculations were performed to determine electronic properties.

Main Results:

• δ3 and δ5 hydrogenated borophenes were found to be dynamically and thermally stable.
• Charge transfer from Boron (B) to Hydrogen (H) atoms is critical for the stability of these phases.
• δ3 and δ5 borophenes exhibit indirect band gaps of 1.51 eV and 1.99 eV, respectively, classifying them as semiconductors.

Conclusions:

• Stable δ3 and δ5 hydrogenated borophenes possess tunable semiconducting properties.
• These materials are suitable candidates for applications in nanoelectronics due to their electronic characteristics and stability.