Chemical control of electrical contact to sp2 carbon atoms

Thomas Frederiksen (), Giuseppe Foti, Fabrice Scheurer, Virginie Speisser and Guillaume Schull ()
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Thomas Frederiksen: Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4
Giuseppe Foti: Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4
Fabrice Scheurer: Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 (CNRS–Université de Strasbourg)
Virginie Speisser: Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 (CNRS–Université de Strasbourg)
Guillaume Schull: Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 (CNRS–Université de Strasbourg)

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Carbon-based nanostructures are attracting tremendous interest as components in ultrafast electronics and optoelectronics. The electrical interfaces to these structures play a crucial role for the electron transport, but the lack of control at the atomic scale can hamper device functionality and integration into operating circuitry. Here we study a prototype carbon-based molecular junction consisting of a single C60 molecule and probe how the electric current through the junction depends on the chemical nature of the foremost electrode atom in contact with the molecule. We find that the efficiency of charge injection to a C60 molecule varies substantially for the considered metallic species, and demonstrate that the relative strength of the metal-C bond can be extracted from our transport measurements. Our study further suggests that a single-C60 junction is a basic model to explore the properties of electrical contacts to meso- and macroscopic sp2 carbon structures.

Date: 2014
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DOI: 10.1038/ncomms4659

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