Vibrational excitation in single-molecule transistors: Deviation from the simple Franck-Condon prediction

Nathalie P. De Leon, Wenjie Liang, Qian Gu, Hongkun Park

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

We investigated the inner-sphere reorganization of ferrocene ((Cp) 2Fe n+) and tris(2,2′-bipyridine) iron ((bpy) 3Fe n+) in a single-molecule-transistor geometry. In (Cp) 2Fe n+ (n = 0 and 1), almost no vibrations were excited during single-electron transport, whereas in (bpy) 3Fe n+ (n = 1, 2, and 3), many distinct vibrations appeared, consistent with its larger reorganization energy. The observed excitation intensities varied significantly across devices, however, and could not be accounted for by "Franck- Condon" factors. This observation indicates that a quantitative account of electron-vibration coupling in single-electron tunneling requires further investigation.

Original languageEnglish (US)
Pages (from-to)2963-2967
Number of pages5
JournalNano Letters
Volume8
Issue number9
DOIs
StatePublished - Sep 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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