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Charge transport in azobenzene-based single-molecule junctions.

Youngsang Kim1, Aran Garcia-Lekue, Dmytro Sysoiev

  • 1Department of Physics, University of Konstanz, 78457 Konstanz, Germany.

Physical Review Letters
|February 2, 2013
PubMed
Summary

Researchers studied electron transport in azobenzene molecules, finding distinct conductance properties for cis and trans isomers. Vibrational fingerprints from inelastic electron tunneling spectroscopy (IETS) can identify these molecular configurations.

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Area of Science:

  • Molecular electronics
  • Condensed matter physics
  • Photochemistry

Background:

  • Azobenzene derivatives undergo cis-trans isomerization upon light exposure, altering molecular properties.
  • Understanding charge transport in different isomers is crucial for molecular device applications.
  • Previous studies lack detailed insights into electron transport mechanisms for azobenzene isomers.

Purpose of the Study:

  • To investigate electron transport through single azobenzene-derivative molecules.
  • To elucidate the differences in conductance between cis and trans isomers.
  • To identify unique spectroscopic signatures for isomer identification.

Main Methods:

  • Fabrication of single-molecule break junctions with gold electrodes.
  • Experimental measurements of current-voltage characteristics and inelastic electron tunneling spectroscopy (IETS) at 4.2 K.
  • First-principles calculations for electron transmission and IETS spectra analysis.

Main Results:

  • Demonstrated a slightly higher conductance for junctions with the cis isomer compared to the trans isomer.
  • Observed distinct vibrational fingerprints in IETS spectra for both cis and trans azobenzene forms.
  • Established a correlation between molecular conformation and electronic transport properties.

Conclusions:

  • The study provides a detailed understanding of electron transport in azobenzene single-molecule junctions.
  • Distinct IETS vibrational spectra serve as reliable fingerprints for differentiating cis and trans isomers.
  • This work paves the way for isomer-selective molecular electronics and sensing applications.