Tuning the thickness of electrochemically grafted layers in large area molecular junctions

Abstract : We have investigated the thickness, the morphology and the transport properties of oligo(1-(2-bisthienyl)benzene) (BTB) thin films grafted on evaporated Au electrodes thanks to a diazonium-based electro-reduction process. Atomic force microscope (AFM) measurements reveal that the thickness is accurately controlled by the number of electrochemical cycles in the 2-27 nm range. The thickness displays a linear dependence with the number of cycles followed by a saturation. Ultrathin (2 nm) and thin (27 nm) large area molecular junctions have then been fabricated. The current-voltage characteristics is fully consistent with a tunneling barrier model whereas for thicker molecular films a rectifying behavior is observed.
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Journal of Applied Physics, American Institute of Physics, 2014, 116 (11), pp.114509. 〈10.1063/1.4896106〉
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Soumis le : vendredi 6 juillet 2018 - 14:07:58
Dernière modification le : samedi 7 juillet 2018 - 01:15:57

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T Fluteau, C. Bessis, C. Barraud, M. L. Della Rocca, P. Martin, et al.. Tuning the thickness of electrochemically grafted layers in large area molecular junctions. Journal of Applied Physics, American Institute of Physics, 2014, 116 (11), pp.114509. 〈10.1063/1.4896106〉. 〈hal-01822392〉

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