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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.
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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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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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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Related Experiment Video

Updated: Sep 18, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Single-molecule contact switching via electro-inductive effects.

Ya-Li Zhang1, Tian-Hang Bai1, Jing-Tao Ye1

  • 1Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, College of Chemistry and Materials Science, Zhejiang Normal University Jinhua 321004 P. R. China xszhou@zjnu.edu.cn yahaowang@zjnu.edu.cn qiangwan@zjnu.edu.cn.

Chemical Science
|June 20, 2025
PubMed
Summary
This summary is machine-generated.

Electro-inductive effects control single-molecule switching by manipulating Lewis adducts. Applied electric fields reversibly control molecular circuits, enabling on/off states for electron transfer.

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Area of Science:

  • Molecular electronics
  • Surface chemistry
  • Electrosynthesis

Background:

  • Non-faradaic electro-inductive effects utilize electrode surface electric fields to polarize molecules.
  • These effects are increasingly explored for modifying chemical reactivity in electrosynthesis.
  • Controlling molecular interactions at interfaces is crucial for molecular electronics.

Purpose of the Study:

  • To investigate the electro-inductive effect for controlling Lewis adduct formation and dissociation.
  • To realize single-molecule contact switching using the electro-inductive effect.
  • To understand the mechanism of electric field-induced bond changes in heterocycles.

Main Methods:

  • In situ single-molecule conductance measurements.
  • In situ Raman spectroscopy.
  • Theoretical calculations (e.g., DFT).
  • Control of Boron trifluoride (BF3) concentration.

Main Results:

  • Outward electric fields (positive electrode) weaken the N-BF3 Lewis bond, promoting dissociation and enabling electron transfer (ON state).
  • Inward electric fields (negative electrode) strengthen the N-BF3 Lewis bond, breaking the molecular circuit (OFF state).
  • Reversible switching of single-molecule conductance and tunneling currents was achieved.

Conclusions:

  • The electro-inductive effect provides a method for reversible single-molecule switching.
  • Electric field-induced polarization of adsorbed molecules modulates Lewis acid-base interactions.
  • This approach offers potential for developing molecular electronic devices.