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Tuning the electronic properties of WS2/Sc2C heterostructures via surface functionalization: a first-principles

Yulin Bu1, Mengtao Sun1

  • 1School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China. mengtaosun@ustb.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|June 25, 2025
PubMed
Summary

Surface functionalization of WS₂/Sc₂C heterostructures with hydrogen or fluorine atoms transforms them into tunable semiconductors. These materials show promise for optoelectronic devices due to controlled band alignment and optical absorption properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Two-dimensional (2D) heterostructures offer tunable electronic and optical properties.
  • WS₂ (Tungsten disulfide) is a semiconductor, while Sc₂C (Scandium carbide) is a metallic MXene.
  • Controlling interfacial coupling is key to tailoring heterostructure behavior.

Purpose of the Study:

  • Investigate the electronic and optical properties of WS₂/Sc₂C heterostructures.
  • Examine the effects of hydrogen (H) and fluorine (F) surface functionalization.
  • Explore band alignment control via electric fields for optoelectronic applications.

Main Methods:

  • First-principles calculations using density functional theory (DFT).
  • Analysis of electronic band structure and band alignment.
  • Simulation of optical properties and response to electric fields.

Main Results:

  • Unfunctionalized WS₂/Sc₂C is metallic due to strong interfacial coupling.
  • H-functionalization yields an indirect semiconductor (0.49 eV bandgap).
  • F-functionalization results in an indirect semiconductor (0.29 eV bandgap).
  • Electric fields can tune the band alignment of semiconducting heterostructures.
  • Significant UV-blue light absorption observed, indicating optoelectronic potential.

Conclusions:

  • Surface functionalization is an effective strategy to tune the electronic properties of 2D heterostructures.
  • WS₂/Sc₂C functionalized with H or F exhibits semiconductor behavior with tunable bandgaps.
  • Controlled band alignment and optical absorption suggest applications in optoelectronics.
  • Provides theoretical guidance for designing novel 2D electronic and photonic devices.