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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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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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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 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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Updated: Apr 15, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Molecular series-tunneling junctions.

Kung-Ching Liao1, Liang-Yan Hsu2, Carleen M Bowers1

  • 1†Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States.

Journal of the American Chemical Society
|April 15, 2015
PubMed
Summary
This summary is machine-generated.

Charge transport in molecular junctions behaves quantum mechanically. Tunneling current densities through series-connected insulating molecular units are independent of their order, following a modified Simmons equation.

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Area of Science:

  • Quantum phenomena in molecular electronics
  • Charge transport mechanisms in self-assembled monolayers

Background:

  • Classical circuit laws inadequately describe charge transport in molecular junctions.
  • Self-assembled monolayers (SAMs) offer a platform for studying quantum tunneling.

Purpose of the Study:

  • To explore tunneling current densities in series-tunneling junctions composed of different insulating molecular units.
  • To analyze the influence of molecular unit order on charge transport rates.

Main Methods:

  • Fabrication of Ag(TS)/O2C-R1-R2-H//Ga2O3/EGaIn junctions with varying insulating units (R1, R2).
  • Analysis of current density (J(V)) using a modified Simmons equation: J(V) = J0(V) exp(-β1d1 - β2d2).
  • Decoupling of molecular orbitals via the Ag/O2C interface to isolate tunneling contributions.

Main Results:

  • Charge transport rates were independent of the order of molecular units (R1 and R2) in the SAM.
  • The electronic structure of R1 and R2 determined tunneling rates, not their sequence.
  • An electrical potential model showed independent contributions of R1 and R2 to the barrier height.

Conclusions:

  • Molecular junctions with series-connected insulating units exhibit quantum tunneling behavior.
  • The order of insulating units does not affect overall charge transport, supporting an additive barrier model.
  • This research provides insights into controlling charge transport in molecular electronic devices.