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Understanding Keesom Interactions in Monolayer-Based Large-Area Tunneling Junctions.

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Analyzing higher statistical moments reveals dynamic charge transport in self-assembled monolayers (SAMs). This approach uncovers how intramolecular interactions and dipole moment direction influence molecule-electrode coupling and tunneling probability under applied bias.

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Area of Science:

  • Molecular electronics
  • Condensed matter physics
  • Surface science

Background:

  • Charge transport across self-assembled monolayers (SAMs) is crucial for molecular electronics.
  • Existing studies show discrepancies in charge tunneling data, necessitating advanced analytical methods.
  • Current structure-property analyses often rely on average tunneling rates, which are dominated by static junction properties.

Purpose of the Study:

  • To develop and apply higher statistical moments (skewness, kurtosis) for analyzing charge tunneling across SAMs.
  • To reveal the dynamic nature of tunnel junctions beyond static properties.
  • To understand the influence of intramolecular interactions and dipole moment orientation on charge transport.

Main Methods:

  • Utilized statistical analysis focusing on higher moments (skewness, kurtosis) of tunneling data.
  • Investigated a series of n-alkanethiols with internal amide and aromatic terminal groups.
  • Examined charge tunneling in large-area molecular junctions under varying applied bias.

Main Results:

  • Higher statistical moments reveal dynamic fluctuations in intramolecular Keesom interactions.
  • The direction of molecular dipole moments significantly impacts molecule-electrode coupling.
  • Applied bias alters tunneling probability and the distribution of tunneling paths within the junction.

Conclusions:

  • Analysis of tunneling data variance, rather than just the average, provides deeper insights into junction dynamics.
  • Stereoelectronic limitations dictate the dynamic fluctuations of intramolecular interactions.
  • Understanding these dynamic processes is key to designing efficient molecular electronic devices.