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Area of Science:

  • Materials Science
  • Organic Electronics
  • Supramolecular Chemistry

Background:

  • Intermolecular charge transport is crucial for organic electronics and biological systems.
  • Previous studies focused on π-π stacking in conjugated systems for charge transport.

Purpose of the Study:

  • To investigate charge transport via σ-σ stacking in non-conjugated molecules.
  • To demonstrate an efficient charge transport pathway through supramolecular junctions.

Main Methods:

  • Fabrication and electrical characterization of molecular junctions using cyclohexanethiol and adamantane.
  • Current-voltage (I-V) measurements and flicker noise analysis.
  • Density Functional Theory (DFT) calculations and non-equilibrium Green's function (NEGF) method.

Main Results:

  • σ-σ stacking in non-conjugated molecules facilitates efficient charge transport.
  • Conductance of σ-σ stacked junctions is comparable to π-π stacked junctions.
  • Evidence of through-space charge transport in stacked molecular junctions was observed.

Conclusions:

  • σ-σ stacking provides a viable and efficient charge transport mechanism.
  • This finding expands the scope of molecular design for organic electronic devices.
  • Supramolecular junctions can be engineered using non-conjugated molecules for charge transport.