Synthesis and electrical properties of fullerene-based molecular junctions on silicon substrate

Details Synthesis and electrical properties of fullerene-based molecular junctions on silicon substrate Synthesis and electrical properties of fullerene-based molecular junctions on silicon substrate

2010-03-06

arxiv.org/abs/1003.1371v2

J. Mater. Chem. 20(13), 2680-2690 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Single pdf file including: main text, figures, tables and supporting information.

Scientific paper

10.1039/b924255d

We report the synthesis and the electrical properties of fullerene-based molecular junctions on silicon substrate in which the highly \pi-conjugated molecule C60 (\pi quantum well) is isolated from the electrodes by alkyl chains (\sigma tunnel barriers). Initially, the Si/SiO2/\sigmaC60 architecture was prepared either by sequential synthesis (3 different routes) or by direct grafting of the presynthesized C60-\sigma-Si(OEt)3 molecule. We described the chemical synthesis of these routes and the physico-chemical properties of the molecular monolayers. Then, the second \sigma tunnel barrier was added on the Si/SiO2/\sigma C60 junction by applying a hanging mercury drop electrode thiolated with an alkanethiol monolayer. We compared the electronic transport properties of the Si/SiO2/\sigma C60//Hg and Si/SiO2/\sigma C60//\sigmaHg molecular junctions, and we demonstrated by transition voltage spectroscopy that the fullerene LUMO - metal Fermi energy offset can be tailored from ~ 0.2 eV to ~ 1 eV by changing the length of the alkyl chain between the C60 core and the Hg metal electrode (i. e. from direct C60//Hg contact to 14 carbon atoms tunnel barrier).

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