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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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https://hal-univ-paris.archives-ouvertes.fr/hal-01822392
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Submitted on : Friday, July 6, 2018 - 2:07:58 PM
Last modification on : Thursday, November 17, 2022 - 4:12:53 AM
Long-term archiving on: : Monday, October 1, 2018 - 2:31:04 AM

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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, 2014, 116 (11), pp.114509. ⟨10.1063/1.4896106⟩. ⟨hal-01822392⟩

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