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Article Dans Une Revue Nanoscale Année : 2023

Nanoscale electronic transport at graphene/pentacene van der Waals interface

Résumé

We report a study on the relationship between structure and electron transport properties of nanoscale graphene/pentacene interfaces. We fabricated graphene/pentacene interfaces from 10-30 nm thick needle-like pentacene nanostructures down to two-three layers (2L-3L) dendritic pentacene islands, and we measured their electron transport properties by conductive atomic force microscopy (C-AFM). The energy barrier at the interfaces, i.e. the energy position of the pentacene highest occupied molecular orbital (HOMO) with respect to the Fermi energy of the graphene and the C-AFM metal tip, are determined and discussed with the appropriate electron transport model (double Schottky diode model and Landauer-Buttiker model, respectively) taking into account the voltage-dependent charge doping of graphene. In both types of samples, the energy barrier at the graphene/pentacene interface is slightly larger than that at the pentacene/metal tip interface, resulting in 0.47-0.55 eV and 0.21-0.34 eV, respectively, for the 10-30 nm thick needle-like pentacene islands, and in 0.92-1.44 eV and 0.67-1.05 eV, respectively, for the 2L-3L thick dendritic pentacene nanostructures. We attribute this difference to the molecular organization details of the pentacene/graphene heterostructures, with pentacene molecules lying flat on the graphene in the needle-like pentacene nansotructures, while standing upright in 2L-3L dendritic islands, as observed from Raman spectroscopy.
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Dates et versions

hal-04076826 , version 1 (21-04-2023)
hal-04076826 , version 2 (04-05-2023)

Identifiants

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Michel Daher Mansour, Jacopo Oswald, Davide Beretta, Michael Stiefe, Roman Furrer, et al.. Nanoscale electronic transport at graphene/pentacene van der Waals interface. Nanoscale, 2023, 15, pp.9203-9213. ⟨10.1039/D2NR06682C⟩. ⟨hal-04076826v2⟩
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