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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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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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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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Tight Junctions01:29

Tight Junctions

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Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
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Adherens Junctions01:24

Adherens Junctions

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
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Single-Molecule Junctions with Highly Improved Stability.

Xinlei Yao1, Maxime Vonesch2, Maïwenn Combes2

  • 1ITODYS, CNRS-UMR 7086, Université de Paris, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France.

Nano Letters
|July 21, 2021
PubMed
Summary

This study demonstrates stable single-molecule junctions (SMJs) using diazonium electroreduction for C-Au covalent bonding. These porphyrin-based molecular junctions show efficient charge transport and long lifetimes, paving the way for advanced molecular electronics.

Keywords:
diazonium electroreductionhoppingmolecular electronicssingle-molecule junctionstunneling

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Single-molecule junctions (SMJs) are crucial for molecular electronics.
  • Fabricating stable SMJs with well-defined molecular-electrode interfaces remains a challenge.
  • Diazonium electroreduction offers a route to covalent surface anchoring.

Purpose of the Study:

  • To fabricate and characterize single-molecule junctions using porphyrin derivatives.
  • To investigate the charge transport properties and stability of these molecular junctions.
  • To explore the influence of molecular structure and metal centers on junction behavior.

Main Methods:

  • Fabrication of SMJs via diazonium electroreduction, creating C-Au covalent bonds.
  • Utilizing scanning tunneling microscopy break junction (STM-bj) technique for conductance measurements.
  • Conducting G(t) measurements to analyze junction dynamics and lifetime.

Main Results:

  • Efficient charge transport observed in porphyrin-based molecular junctions.
  • Conductance is influenced by the presence of a cobalt center within the porphyrin.
  • Stable SMJs with a long lifetime (around 10 seconds) were achieved.
  • Random telegraph signals indicating on/off states were recorded.

Conclusions:

  • Diazonium grafting is an effective method for preparing highly stable single-molecule junctions.
  • Porphyrin derivatives, especially with cobalt centers, exhibit promising charge transport properties for molecular electronics.
  • The demonstrated stability and long lifetime of SMJs open avenues for practical applications.