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Structure Controlled Long-Range Sequential Tunneling in Carbon-Based Molecular Junctions.

Amin Morteza Najarian1,2, Richard L McCreery1,2

  • 1Department of Chemistry, University of Alberta , Edmonton,Alberta T6G 2R3, Canada.

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Summary
This summary is machine-generated.

Charge transport in carbon molecular junctions is determined by the molecule's energy gap, not electrode interfaces. This finding challenges conventional models for electronic devices and organic electronics.

Keywords:
charge transportelectronic couplinglocalization lengthmolecular electronicsmultistep tunnelingthermally assisted tunneling

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Area of Science:

  • Molecular Electronics
  • Organic Electronics
  • Nanotechnology

Background:

  • Carbon-based molecular junctions are key components in organic electronics.
  • Understanding charge transport mechanisms is crucial for device optimization.
  • Previous models often assumed electrode-interface limited transport.

Purpose of the Study:

  • To investigate charge transport mechanisms in carbon-based molecular junctions.
  • To determine the factors influencing current density in these systems.
  • To correlate molecular structure and electronic properties with transport behavior.

Main Methods:

  • Fabrication of molecular junctions using aromatic oligomers and sp2 carbon electrodes.
  • Measurement of current density (J) versus bias voltage (V) and temperature.
  • Analysis of molecular layer thickness (d) dependence on J.
  • UV-vis absorption spectroscopy to probe internal energy levels and delocalization.

Main Results:

  • Observed nonlinear ln J vs V, deviating from conventional tunneling or hopping.
  • Weak temperature dependence of current density.
  • Current density showed no correlation with free-molecule HOMO/LUMO energies.
  • Current density correlated with UV-vis absorption maxima, indicating HOMO-LUMO gap control.

Conclusions:

  • Charge transport is governed by multistep tunneling through the HOMO-LUMO gap.
  • Electrode interface injection is not rate-limiting due to strong electronic coupling.
  • Transport is controlled by the bulk properties of the molecular layer interior.