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Related Concept Videos

Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Updated: Apr 14, 2026

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Spin-polarized light-emitting diodes based on CrI₃ operating without external spin injection.

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Monolayer chromium triiodide (CrI₃) enables new spin-polarized light-emitting diodes. This approach bypasses complex growth methods, offering a promising platform for on-chip spin-optoelectronics.

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Area of Science:

  • Spintronics
  • Materials Science
  • Optoelectronics

Background:

  • Spin-polarized light-emitting diodes (SPLEDs) are crucial for on-chip information processing, converting electron spin to circularly polarized light.
  • Existing SPLEDs often use GaAs-based emitters, requiring complex epitaxial growth and facing challenges in achieving high circular polarization.
  • Efficient spin injection, transport, and recombination are critical for high-performance SPLEDs, necessitating high-quality materials.

Purpose of the Study:

  • To develop an alternative approach for SPLEDs using monolayer chromium triiodide (CrI₃) as the light-emitting material.
  • To investigate the feasibility of using graphene/hexagonal boron nitride tunneling contacts for carrier injection.
  • To demonstrate controllable circular polarization of electroluminescence governed by the magnetic order of CrI₃.

Main Methods:

  • Fabrication of a heterostructure device with monolayer CrI₃ sandwiched between graphene/hexagonal boron nitride tunneling contacts.
  • Electrical characterization of carrier injection and electroluminescence (EL) properties.
  • Investigation of the magnetic field dependence of EL polarization.

Main Results:

  • Electroluminescence exhibiting circular polarization was achieved despite injection of unpolarized carriers.
  • The polarization helicity was directly controlled by the magnetic order of the monolayer CrI₃ emitter.
  • A significant degree of polarization (20%) was observed, reversible with a low magnetic field (~0.17 T).

Conclusions:

  • Monolayer CrI₃ serves as an effective emitter for SPLEDs, offering an alternative to traditional GaAs-based devices.
  • The heterostructure approach demonstrates inherent integrability, simplifying device fabrication.
  • This CrI₃-based platform presents a promising avenue for future on-chip spin-optoelectronic applications.