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Related Concept Videos

Biasing of P-N Junction01:16

Biasing of P-N Junction

884
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...
884
P-N junction01:11

P-N junction

684
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
684

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Updated: Sep 15, 2025

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
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Current Crowding in a High-Efficiency Black Phosphorus Light-Emitting Diode Using a Reflective Back Contact.

Julien Brodeur1, Éloïse Rahier1, Mathieu Chartray-Pronovost2

  • 1Department of Engineering Physics, Polytechnique Montréal, Montréal H3T 1J4, Canada.

Nano Letters
|July 18, 2025
PubMed
Summary
This summary is machine-generated.

We developed a high-performance mid-infrared (MIR) light-emitting diode (LED) using black phosphorus (b-P) and n-type Molybdenum disulfide (MoS2). This novel 2D material heterojunction achieves record efficiencies for MIR light emission.

Keywords:
2D materialsBlack phosphorusCurrent crowdingIdeality factorLight-emitting diodesMid-infrared Emission

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Mid-infrared (MIR) light-emitting diodes (LEDs) are crucial for various applications, including sensing and communication.
  • Developing efficient and high-performance MIR LEDs based on novel materials remains a significant challenge.

Purpose of the Study:

  • To demonstrate a high-performance MIR LED utilizing a black phosphorus (b-P)/n-type Molybdenum disulfide (MoS2) heterojunction.
  • To investigate the underlying physics governing the device performance through experimental characterization and finite-element simulations.

Main Methods:

  • Fabrication of a b-P/n-MoS2 heterojunction LED with enhanced light extraction features (gold back contact, Re-doped n-MoS2).
  • Experimental characterization of the LED's performance, including external quantum efficiency (EQE) and radiant power density at room temperature and 77 K.
  • Finite-element simulations to model device physics, including carrier transport mechanisms and current crowding effects.

Main Results:

  • Achieved a peak MIR external quantum efficiency (EQE) of (1.6 ± 0.2)% at room temperature and a record (7.0 ± 0.5)% EQE at 77 K.
  • Demonstrated a maximum radiant power density of (108 ± 8) W/cm².
  • Simulations revealed the significance of phonon-assisted band-to-band tunneling and carrier velocity saturation, and explained high ideality factors due to current crowding and device geometry.

Conclusions:

  • Established a new high-performance b-P LED architecture for MIR light emission.
  • Provided crucial insights into the physics of MIR sources based on two-dimensional (2D) materials.
  • The b-P/n-MoS2 heterojunction offers a promising platform for advanced optoelectronic devices.