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Functionalized hexagonal boron nitride bilayers: desirable electro-optical properties for optoelectronic

Huabing Shu1

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Functionalizing hexagonal boron nitride (h-BN) bilayers transforms them into direct narrow-gap semiconductors with strong light absorption. This makes them promising for optoelectronic applications due to enhanced stability and reduced electron-hole recombination.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Hexagonal boron nitride (h-BN) is an insulating material with a wide bandgap.
  • Exploring functionalization of h-BN bilayers is crucial for tuning its electronic and optical properties.
  • Previous studies have not fully explored the potential of functionalized h-BN bilayers for optoelectronics.

Purpose of the Study:

  • To investigate the structural, electronic, and optical properties of functionalized h-BN bilayers.
  • To explore the potential of these functionalized materials for optoelectronic applications.
  • To understand the impact of hydrogenation, hydrofluorination, and fluorination on h-BN bilayer properties.

Main Methods:

  • Utilized PBE + G0W0 + BSE calculations for theoretical exploration.
  • Analyzed phonon dispersions to assess dynamic stability.
  • Investigated changes in electronic band structure and optical absorbance.

Main Results:

  • Functionalization (hydrogenation, hydrofluorination, fluorination) induces sp3 bonding, forming diamane-like monolayers.
  • Transformed h-BN bilayers from indirect wide-gap insulators to direct narrow-gap semiconductors.
  • Achieved strong absorbance coefficients (>10^5 cm^-1) in the near-infrared and visible spectrum.
  • Observed exciton binding energies exceeding 1 eV, reducing photogenerated electron-hole recombination.

Conclusions:

  • Functionalized h-BN bilayers exhibit promising semiconductor properties for optoelectronics.
  • The enhanced stability and optical absorption make them suitable for solar energy applications.
  • These findings pave the way for novel optoelectronic devices based on h-BN bilayers.