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Related Concept Videos

P-N junction01:11

P-N junction

543
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...
543
Biasing of P-N Junction01:16

Biasing of P-N Junction

551
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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

354
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...
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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

261
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...
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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Ferroelectric Domain Wall p-n Junctions.

Jesi R Maguire1, Conor J McCluskey1, Kristina M Holsgrove1

  • 1School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, U.K.

Nano Letters
|November 10, 2023
PubMed
Summary
This summary is machine-generated.

Researchers mapped electrical potential in lithium niobate thin films. Domain wall junctions behave differently than semiconductor junctions, impacting future nanoelectronic applications.

Keywords:
domain wallsdomain-wall electronicsdomainsferroelectricsp−n junctions

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Ferroelectric domain walls in lithium niobate present unique electrical properties.
  • Understanding these properties is crucial for developing novel nanoelectronic devices.
  • Conventional semiconductor junction physics may not directly apply to ferroelectric domain walls.

Purpose of the Study:

  • To investigate the spatial distribution of electrical potential along conducting domain walls.
  • To analyze the behavior of p-n junctions within these domain walls.
  • To determine the underlying physics governing these in-wall junctions.

Main Methods:

  • Utilized high-voltage Kelvin probe force microscopy (KPFM) for potential mapping.
  • Examined x-cut single-crystal ferroelectric lithium niobate thin films.
  • Performed in-operando measurements during current carrying.

Main Results:

  • Electrical potential profiles and electric fields were mapped along domain walls.
  • Observed p-n junctions within domain walls were explained by resistivity variations alone.
  • No additional physics, such as carrier depletion or space-charge fields, were required for explanation.

Conclusions:

  • In-wall junctions in ferroelectric domain walls do not require conventional semiconductor junction physics.
  • Fermi level differences, key to semiconductor junctions, are absent in these domain walls.
  • Domain wall nanoelectronics will exhibit distinct behaviors compared to extrinsic semiconductor systems, affecting device functionality.