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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

309
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
309
Semiconductors01:22

Semiconductors

657
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
657
Types of Semiconductors01:20

Types of Semiconductors

553
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
553
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

222
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
222

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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UV-A Flexible LEDs Based on Core-Shell GaN/AlGaN Quantum Well Microwires.

Nuno Amador-Mendez1, Fedor M Kochetkov2,3, Roberto Hernandez1

  • 1Centre de Nanosciences et de Nanotechnologies (C2N), UMR 9001 CNRS, Univ. Paris-Saclay, 10 Boulevard Thomas Gobert, 91120 Palaiseau, France.

ACS Applied Materials & Interfaces
|September 11, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed the first flexible ultraviolet-A (UV-A) light-emitting diode (LED) using AlGaN/GaN microwires and carbon nanotube electrodes. This innovation enables new possibilities for wearable optoelectronics and medical treatments.

Keywords:
III−V semiconductorsPDMSUV-A light-emitting diodescarbon nanotubesflexible electronicsluminophoresmicrowires

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Nanostructured ultraviolet (UV) light sources are crucial for applications like wearable optoelectronics and medical treatments.
  • Flexible UV-A LEDs are highly sought after for advanced device integration.

Purpose of the Study:

  • To demonstrate the first flexible UV-A light-emitting diode (LED) utilizing AlGaN/GaN core-shell microwires.
  • To optimize transparent electrodes for UV applications and integrate them with a flexible membrane.

Main Methods:

  • Fabrication of a composite microwire/poly(dimethylsiloxane) (PDMS) membrane with flexible transparent electrodes.
  • Utilizing single-walled carbon nanotube electrodes for stable electrical contact and high UV transparency (70% at 350 nm).
  • Demonstrating UV-A electroluminescence around 345 nm and its application in exciting luminophores for visible light emission.

Main Results:

  • Successful demonstration of a flexible UV-A LED based on AlGaN/GaN core-shell microwires.
  • Single-walled carbon nanotube electrodes achieved high transparency and stability in the UV range.
  • The UV-A LED successfully excited luminophores to produce visible amber emission (520–650 nm).

Conclusions:

  • The developed flexible UV-A membrane opens avenues for novel optoelectronic devices.
  • This technology is promising for applications in sensing, fluorescent label detection, and light therapy.
  • The study paves the way for flexible inorganic LEDs with diverse functionalities.