Free-electron-like dispersion in an organic monolayer film on a metal substrate

R. Temirov, S. Soubatch, A. Luican and F. S. Tautz ()
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R. Temirov: School of Engineering and Science, International University Bremen
S. Soubatch: School of Engineering and Science, International University Bremen
A. Luican: School of Engineering and Science, International University Bremen
F. S. Tautz: School of Engineering and Science, International University Bremen

Nature, 2006, vol. 444, issue 7117, 350-353

Abstract: Currents at large When a current flows through a molecular material, the electrons may either hop slowly from molecule to molecule, or they may move swiftly through the material at large. The latter mechanism is possible only if the electronic states involved in current flow are dispersed and allow extensive electron delocalization. Scanning tunnelling microscopy experiments on an archetypal organic semiconductor (PTCDA) deposited on a silver substrate have now made extensive dispersion and electron delocalization visible for the first time in a thin molecular layer. The observed dispersion is far stronger than expected for the organic material alone. This suggests that strong electron mobility enhancements — as often desired for electronic applications — may be achieved by tailoring the intermolecular coupling between organic molecules and their metal substrate.

Date: 2006
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DOI: 10.1038/nature05270

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