Charge Transport in Azobenzene-Based Single-Molecule Junctions

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2012
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Garcia-Lekue, Aran
Frederiksen, Thomas
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Physical Review Letters. 2012, 109(22). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.109.226801
Zusammenfassung

Azobenzene-derivative molecules change their conformation as a result of a cis-trans transition when exposed to ultraviolet or visible light irradiation and this is expected to induce a significant variation in the conductance of molecular devices. Despite extensive investigations carried out on this type of molecule, a detailed understanding of the charge transport for the two isomers is still lacking. We report a combined experimental and theoretical analysis of electron transport through azobenzene-derivative single-molecule break junctions with Au electrodes. Current-voltage and inelastic electron tunneling spectroscopy (IETS) measurements performed at 4.2 K are interpreted based on first-principles calculations of electron transmission and IETS spectra. This qualitative study unravels the origin of a slightly higher conductance of junctions with the cis isomer and demonstrates that IETS spectra of cis and trans forms show distinct vibrational fingerprints that can be used for identifying the isomer.

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ISO 690KIM, Youngsang, Aran GARCIA-LEKUE, Dmytro SYSOIEV, Thomas FREDERIKSEN, Ulrich GROTH, Elke SCHEER, 2012. Charge Transport in Azobenzene-Based Single-Molecule Junctions. In: Physical Review Letters. 2012, 109(22). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.109.226801
BibTex
@article{Kim2012Charg-20984,
  year={2012},
  doi={10.1103/PhysRevLett.109.226801},
  title={Charge Transport in Azobenzene-Based Single-Molecule Junctions},
  number={22},
  volume={109},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Kim, Youngsang and Garcia-Lekue, Aran and Sysoiev, Dmytro and Frederiksen, Thomas and Groth, Ulrich and Scheer, Elke}
}
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