Tunable electronic properties induced by a defect-substrate in graphene/BC3 heterobilayers

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Graphene's unique electronic properties make it a promising material for next-generation electronics.
• Developing methods to open a band gap in graphene is crucial for its application in field-effect transistors (FETs).
• BC3 monolayer is explored as a potential substrate for modifying graphene's electronic characteristics.

Purpose of the Study:

• To investigate the structural, energetic, and electronic properties of graphene supported on a BC3 monolayer.
• To determine the feasibility of creating a tunable band gap in graphene/BC3 heterobilayers (G/BC3 HBLs).
• To assess the potential of G/BC3 HBLs for applications in electronic devices like FETs.

Main Methods:

• First-principles calculations were employed to simulate the graphene/BC3 system.
• Analysis of geometric structure, binding energies, and electronic band structure was performed.
• The effects of interlayer spacing and in-plane strain on the electronic properties were studied.

Main Results:

• Graphene weakly interacts with the BC3 monolayer through van der Waals forces.
• A significant energy gap of approximately 0.162 eV was observed in G/BC3 HBLs, suitable for room-temperature operation.
• Interlayer spacing and in-plane strain effectively tune the band gap of G/BC3 HBLs.
• The Dirac cone characteristics and near-linear band dispersion of graphene are preserved, with a small electron effective mass, indicating high carrier mobility.

Conclusions:

• Graphene/BC3 heterobilayers offer a promising route for band gap engineering in graphene.
• The tunable band gap and preserved high carrier mobility make G/BC3 HBLs suitable for designing effective FETs.
• This study provides valuable insights for the rational design of graphene-based electronic devices on BC3 substrates.