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Layer-Number Engineered Momentum-Indirect Interlayer Excitons with Large Spectral Tunability.

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We report robust interlayer exciton (IX) emission in transition-metal dichalcogenide/2D perovskite heterostructures. This breakthrough enables tunable optoelectronic devices without complex fabrication, paving the way for broad-spectrum applications.

Keywords:
2D perovskitesinterlayer excitonsspectral tunabilitytransition-metal dichalcogenidesvan der Waals heterostructures

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Type II van der Waals (vdW) heterostructures host interlayer excitons (IXs) with potential for excitonic and optoelectronic devices.
  • Existing transition-metal dichalcogenide (TMD) heterostructures face challenges due to lattice mismatch and misalignment, complicating device fabrication.

Purpose of the Study:

  • To investigate robust momentum-indirect IX emission in novel TMD/2D perovskite vdW heterostructures.
  • To demonstrate the tunability of IX emission energy for broad-spectrum optoelectronic applications.

Main Methods:

  • Fabrication of vdW heterostructures comprising TMDs and 2D perovskites.
  • Characterization of interlayer exciton properties, including emission energy and diffusion coefficient.
  • Systematic tuning of IX emission by varying the layer number of 2D perovskites and TMD flake thickness.

Main Results:

  • Achieved robust momentum-indirect IX emission in TMD/2D perovskite vdW heterostructures, irrespective of orientation or momentum mismatch.
  • Observed a high IX diffusion coefficient of approximately 10 cm² s⁻¹.
  • Demonstrated wide tunability of IX emission energy from 1.3 to 1.6 eV through material composition and thickness control.

Conclusions:

  • TMD/2D perovskite vdW heterostructures offer a promising platform for robust IX emission.
  • vdW interface engineering provides a facile route to tune optoelectronic properties for broad-spectrum applications.
  • These findings advance the development of next-generation excitonic and optoelectronic devices.