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Infrared optoelectronics in twisted black phosphorus.

Shouheng Chen1, Zihan Liang1, Jinshui Miao2

  • 1Department of Electronic and Electrical Engineering, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen, 518055, China.

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|October 13, 2024
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Summary
This summary is machine-generated.

Twisted interfaces in black phosphorus (BP) heterostructures enable infrared light emission and voltage-free electron-hole separation. Engineering these van der Waals interfaces offers new strategies for optoelectronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Electrons and holes are key charge carriers in semiconductors, crucial for optical transitions and detection.
  • Twisted van der Waals (vdW) heterostructures provide a method to control electron-hole pair dynamics via atomically sharp interfaces.

Purpose of the Study:

  • To investigate how twisted interfaces in vdW layered black phosphorus (BP) affect electron-hole pair recombination and separation.
  • To explore the potential of engineered vdW interfaces for novel optoelectronic applications.

Main Methods:

  • Fabrication and characterization of twisted vdW black phosphorus heterostructures.
  • Experimental measurements of optical transitions and charge carrier dynamics.
  • First-principles calculations to support experimental findings across various twist angles (0-90°).

Main Results:

  • Twisted interfaces break symmetry, enabling infrared light emission from symmetry-forbidden optical states in black phosphorus.
  • Spontaneous electronic polarization and bulk photovoltaic effect at twisted interfaces facilitate electron-hole separation without external bias.
  • Observed phenomena in heterostructures thicker than two-dimensional, indicating robustness.

Conclusions:

  • Engineering vdW twisted interfaces in black phosphorus significantly alters optoelectronic properties.
  • This approach enables manipulation of electron-hole recombination and separation processes.
  • Results suggest a viable strategy for developing advanced optoelectronic devices.