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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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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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Related Experiment Video

Updated: Feb 18, 2026

Atomically Traceable Nanostructure Fabrication
12:35

Atomically Traceable Nanostructure Fabrication

Published on: July 17, 2015

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Au nanowire junction breakup through surface atom diffusion.

Simon Vigonski1,2, Ville Jansson2, Sergei Vlassov3

  • 1Institute of Technology, University of Tartu, Nooruse 1, 50411, Tartu, Estonia.

Nanotechnology
|November 14, 2017
PubMed
Summary
This summary is machine-generated.

Metallic nanowires fragment at junctions due to heat, hindering devices. This study reveals fragmentation begins at junctions, suggesting grid alignment can create nanodot arrays for sensors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Metallic nanowires are susceptible to fragmentation via Rayleigh instability, especially at high temperatures.
  • This instability can impair nanowire-based devices like transparent conductive coatings.
  • Arranged gold nanodots are valuable for electrochemical sensors.

Purpose of the Study:

  • Investigate the fragmentation of gold and silver nanowires and junctions under annealing.
  • Determine the temperature dependence and origin of nanowire fragmentation, particularly at junctions.
  • Explore the potential for fabricating nanodot arrays using controlled nanowire fragmentation.

Main Methods:

  • Annealing experiments on gold and silver nanowires and junctions at 473, 673, 873, and 973 K for 10 minutes.
  • Kinetic Monte Carlo simulations with a gold parametrization.
  • Analysis of fragmentation patterns, focusing on junction regions.

Main Results:

  • Nanowires fragment preferentially at junctions and crossing points, even at lower temperatures.
  • Fragmentation is highly temperature-dependent, with junctions breaking before single nanowires.
  • Surface diffusion is identified as the primary mechanism for junction fragmentation.
  • Fragmentation reliably initiates at junctions.

Conclusions:

  • Nanowire junctions are critical sites for fragmentation due to surface diffusion.
  • Controlled fragmentation of nanowires at junctions offers a novel method for nanodot array fabrication.
  • This technique could advance the development of nanomaterial-based sensors and coatings.