2D BN-biphenylene: structure stability and properties tenability from a DFT perspective.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Two-dimensional (2D) materials offer unique electronic and mechanical properties.
• Biphenylene (BPh) is a recently synthesized 2D material with metallic characteristics.
• Exploring analogs of 2D materials is crucial for discovering new functionalities.

Purpose of the Study:

• To investigate the stability and properties of the boron nitride (BN) analog of 2D biphenylene (BN-BPh).
• To analyze the electronic, mechanical, optical, and vibrational characteristics of BN-BPh.
• To assess the feasibility of synthesizing BN-BPh and its potential applications.

Main Methods:

• State-of-the-art density functional theory (DFT) calculations.
• Ab initio molecular dynamics (AIMD) simulations.
• Phonon spectrum analysis and Born criteria for stability assessment.

Main Results:

• BN-BPh exhibits excellent dynamical, thermal, and mechanical stability.
• Calculations reveal a significant band gap (3.12–4.48 eV), classifying it as a semiconductor.
• Mechanical strength is comparable to biphenylene, and optical absorption peaks are identified.
• Substitutional doping allows tuning of electronic properties from semiconducting to metallic.

Conclusions:

• BN-BPh is a stable, synthesized 2D material with promising electronic and optical properties.
• Its tunable band gap and mechanical robustness suggest potential applications in electronics, optics, and spintronics.
• The material's stability under high pressure further broadens its application scope.