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Related Concept Videos

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...
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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

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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.
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P-N junction01:11

P-N junction

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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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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Two-Dimensional Antiferroelectric Tunnel Junction.

Jun Ding1,2, Ding-Fu Shao1, Ming Li1

  • 1Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0299, USA.

Physical Review Letters
|February 19, 2021
PubMed
Summary
This summary is machine-generated.

Researchers propose novel 2D antiferroelectric tunnel junctions (AFTJs) using van der Waals materials for advanced nanoscale memory devices. These antiferroelectric tunnel junctions exhibit giant tunneling electroresistance and multiple nonvolatile resistance states.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ferroelectric tunnel junctions (FTJs) are nanoscale resistive switching devices utilizing ferroelectric barriers.
  • Traditional FTJs often use perovskite-oxide barriers.
  • Two-dimensional (2D) van der Waals ferroelectric materials offer new possibilities for nanoscale tunnel junctions with tunable functionalities.

Purpose of the Study:

  • To propose and investigate 2D antiferroelectric tunnel junctions (AFTJs) based on bilayer In2X3 (X=S, Se, Te) van der Waals materials.
  • To explore the potential of these AFTJs for novel nanoscale memory devices.

Main Methods:

  • First-principles density functional theory (DFT) calculations to study the stability of ferroelectric and antiferroelectric states in In2X3 bilayers.
  • Quantum-mechanical modeling of electronic transport to analyze tunneling phenomena.
  • Investigated both in-plane and out-of-plane tunneling.

Main Results:

  • Demonstrated stable ferroelectric and antiferroelectric states in In2X3 bilayers with significant energy barriers, enabling nonvolatile switching.
  • Predicted giant tunneling electroresistance (TER) effects.
  • Observed multiple nonvolatile resistance states driven by ferroelectric-antiferroelectric order transitions.

Conclusions:

  • The proposed 2D AFTJs based on In2X3 van der Waals materials offer a promising route for next-generation nanoscale memory devices.
  • These devices exhibit unique properties like giant TER and multiple resistance states, enabling ultrahigh storage density.