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Molecular-based electronically switchable tunnel junction devices.

C P Collier1, J O Jeppesen, Y Luo

  • 1California NanoSystems Institute and the Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569, USA.

Journal of the American Chemical Society
|December 14, 2001
PubMed
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Researchers developed molecular electronic devices using bistable catenanes, pseudorotaxanes, and rotaxanes. These molecular switches demonstrated tunable conductivity, paving the way for novel electronic components.

Area of Science:

  • Molecular electronics
  • Supramolecular chemistry
  • Materials science

Background:

  • Molecular switches are crucial for developing advanced electronic devices.
  • Controlling conductivity at the molecular level is a key challenge in nanotechnology.

Purpose of the Study:

  • To fabricate and characterize solid-state tunnel junction devices using molecular monolayers.
  • To investigate the relationship between molecular structure, film properties, and device performance.

Main Methods:

  • Fabrication of Langmuir Blodgett molecular monolayers of bistable [2]catenane, bistable [2]pseudorotaxane, and single-station [2]rotaxane.
  • Characterization of current-voltage (I-V) response in solid-state tunnel junction devices.
  • Analysis of structure-property correlations, including solution-phase dynamics and crystallographic domain structure.

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Main Results:

  • All fabricated devices exhibited noncapacitive hysteretic current-voltage response.
  • Devices switched between high- and low-conductivity states, indicating molecular switching behavior.
  • Control devices without molecular monolayers showed no such response.

Conclusions:

  • Molecular monolayers of bistable catenanes, pseudorotaxanes, and rotaxanes can function as solid-state switches.
  • Device performance is influenced by the molecular structure, dynamics, and film morphology.
  • These findings demonstrate the potential of supramolecular systems in molecular electronics.