Title :

Thermoelectric Properties of Benzothieno-Benzothiophene Self-Assembled Monolayers in Molecular Junctions

Author(s) :

Gonzalez-Casal, Sergio [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]
Jouclas, Rémy [Auteur]
Université libre de Bruxelles [ULB]
Arbouch, Imane [Auteur]
Université de Mons / University of Mons [UMONS]
Geerts, Yves [Auteur]
Université libre de Bruxelles [ULB]
van Dyck, Colin [Auteur]
Université de Mons / University of Mons [UMONS]
Cornil, Jérôme [Auteur]
Université de Mons / University of Mons [UMONS]
Vuillaume, Dominique [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]

Journal title :

Journal of Physical Chemistry Letters

Pages :

11593-11600

Publisher :

American Chemical Society

Publication date :

2024

ISSN :

1948-7185

English keyword(s) :

Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Applied Physics (physics.app-ph)

HAL domain(s) :

Physique [physics]
Physique [physics]/Matière Condensée [cond-mat]

English abstract : [en]

We report a combined experimental (C-AFM and SThM) and theoretical (DFT) study of the thermoelectric properties of molecular junctions made of self-assembled monolayers on Au of thiolated benzothieno-benzothiophene (BTBT) ...
Show more >We report a combined experimental (C-AFM and SThM) and theoretical (DFT) study of the thermoelectric properties of molecular junctions made of self-assembled monolayers on Au of thiolated benzothieno-benzothiophene (BTBT) and alkylated BTBT derivatives (C8-BTBT-C8). We measure the thermal conductance per molecule at 15 pW/K and 8.8 pW/K, respectively, among the lowest values for molecular junctions so far reported (10-50 pW/K). The lower thermal conductance for C8-BTBT-C8 is consistent with two interfacial thermal resistances introduced by the alkyl chains, which reduce the phononic thermal transport in the molecular junction. The Seebeck coefficients are 36 μV/K and 245 μV/K, respectively, the latter due to the weak coupling of the core BTBT with the electrodes. We deduce a thermoelectric figure of merit ZT up to ca. 1E-4 for the BTBT molecular junctions at 300K, on a par with the values reported for archetype molecular junctions (olygo(phenylene ethynylene) derivatives).Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Fils moléculaires modulables présentant des interférences quantiques pour pour des applications thermoélectriques

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL