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Schottky Barrier Diode01:27

Schottky Barrier Diode

857
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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P-N junction01:11

P-N junction

1.0K
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...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
800
Semiconductors01:22

Semiconductors

1.3K
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...
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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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The Ideal Diode01:15

The Ideal Diode

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A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...
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Related Experiment Video

Updated: Dec 27, 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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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Core-Shell Tunnel Junction Nanowire White-Light-Emitting Diode.

Yong-Ho Ra1, Cheul-Ro Lee2

  • 1Optic & Electronic Component Material Center, Korea Institute of Ceramic Engineering & Technology, Jinju 52851, Republic of Korea.

Nano Letters
|February 28, 2020
PubMed
Summary

Researchers developed novel phosphor-free white LEDs using tunnel junction InGaN nanowires. This technology enhances efficiency and reduces voltage loss for advanced solid-state lighting.

Keywords:
core−shelllight emitting diodenanowireselective area epitaxytunnel junction

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Conventional white LEDs often rely on phosphors, which can limit efficiency and color quality.
  • Indium Gallium Nitride (InGaN) nanowires offer potential for advanced LED structures due to their unique properties.

Purpose of the Study:

  • To demonstrate a new class of phosphor-free white LEDs.
  • To investigate the use of tunnel junction structures in nonpolar core-shell InGaN nanowires.
  • To enhance carrier injection and reduce voltage loss in LEDs.

Main Methods:

  • Fabrication of nonpolar core-shell InGaN nanowires with integrated tunnel junctions.
  • Utilizing Transmission Electron Microscopy (TEM) for structural analysis.
  • Demonstrating monolithic integration of multiple-color emission.

Main Results:

  • Successfully created phosphor-free white LEDs using tunnel junction InGaN nanowires.
  • Eliminated the need for resistive p-GaN:Mg contact layers, improving hole injection.
  • Achieved significantly reduced voltage loss and enhanced carrier injection efficiency.
  • Verified uniform growth of Al tunnel junction layers on nonpolar GaN nanowires via TEM.
  • Showcased monolithic integration of multiple-color emission on a single chip.

Conclusions:

  • Nonpolar core-shell tunnel junction nanowire LEDs represent a promising advancement for solid-state lighting.
  • This technology offers a viable alternative to conventional film-based quantum well LEDs.
  • The demonstrated approach enables efficient, phosphor-free white light emission and multi-color integration.