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Localized Excitons in NbSe2-MoSe2 Heterostructures.

Jaydeep Joshi1,2, Tong Zhou3, Sergiy Krylyuk4

  • 1Department of Physics and Astronomy, George Mason University, Fairfax, Virginia 22030, United States.

ACS Nano
|July 9, 2020
PubMed
Summary

Researchers studied NbSe2-MoSe2 van der Waals heterostructures to understand optical properties. They discovered a new localized emission feature (L1) in MoSe2, crucial for developing advanced optoelectronics.

Keywords:
density functional theoryexcitonsphotoluminescencetransition metal dichalcogenidesvan der Waals heterostructures

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Atomically thin materials exhibit unique optical properties due to excitons and trions, vital for photonic applications.
  • Van der Waals (vdW) heterostructures enable novel optical phenomena driven by interlayer interactions.
  • Metal-semiconductor interfaces are key components in optoelectronic devices.

Purpose of the Study:

  • To investigate the optical properties of NbSe2-MoSe2 vdW heterostructures.
  • To understand exciton behavior at metal-semiconductor interfaces in 2D materials.
  • To explore the origin of observed optical emission features.

Main Methods:

  • Low-temperature photoluminescence (PL) microscopy was employed to study optical emission.
  • First-principles calculations were used to model electronic band structures and confinement potentials.
  • Fabrication of vdW heterostructures with varying stacking and cleaning procedures.

Main Results:

  • A sharp emission feature (L1) was discovered in NbSe2-capped MoSe2 regions, below known MoSe2 excitons.
  • L1 exhibits temperature- and power-dependent PL, consistent with localized excitons.
  • In-plane band bending due to altered electron affinity in the heterostructure was identified as the source of confinement.

Conclusions:

  • NbSe2-MoSe2 heterostructures serve as a model for metal-semiconductor interfaces in 2D materials.
  • Exciton localization in NbSe2-MoSe2 heterostructures is driven by intrinsic band bending.
  • These findings have implications for designing atomically thin optoelectronics with tunable electronic properties.