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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.3K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.3K
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

492
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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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

2.8K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.4K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
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Updated: Dec 28, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Electron-Phonon Coupling in Current-Driven Single-Molecule Junctions.

Hai Bi1, Carlos-Andres Palma1,2,3, Yuxiang Gong1

  • 1Physics Department , Technical University of Munich , James-Franck-Str. 1 , 85748 Garching , Germany.

Journal of the American Chemical Society
|February 20, 2020
PubMed
Summary
This summary is machine-generated.

Researchers quantified charge-vibrational coupling in single-molecule electronics. They found approximately 0.5 vibrational excitations per elementary charge during transport, crucial for optimizing molecular devices.

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Area of Science:

  • Molecular Electronics
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Charge transport in single molecules involves energy dissipation via vibrational excitations.
  • Understanding charge-vibrational (electron-phonon) coupling is critical for molecular electronics.
  • Quantitative measurement of this coupling at the single-molecule level remains a challenge.

Purpose of the Study:

  • To quantitatively determine charge-vibrational coupling characteristics in a single-molecule junction.
  • To establish a method for assessing vibrational excitation during charge transport.
  • To provide insights for optimizing charge-transport efficiencies in molecular configurations.

Main Methods:

  • Synchronous vibrational and current-voltage spectroscopy of metal-molecule-metal junctions.
  • Time-resolved infrared spectroscopy for intramolecular vibrational relaxation dynamics.
  • Anti-Stokes Raman scattering to measure steady-state vibrational distribution during charge transport.

Main Results:

  • Exemplary determination of coupling characteristics for a bis-phenylethynyl-anthracene derivative.
  • Measurement of approximately 0.5 vibrational excitations per elementary charge passing through the junction.
  • Analysis supported by a rate model ansatz and quantum-chemical calculations.

Conclusions:

  • The study demonstrates a method to quantify charge-vibrational coupling in single-molecule junctions.
  • Findings provide a basis for rationalizing and optimizing charge-transport efficiencies.
  • This work advances the understanding of energy dissipation in molecular electronic devices.