| Title: |
Thermal conductivity of benzothieno-benzothiophene derivatives at the nanoscale |
| Authors: |
Gueye, Magatte; Vercouter, Alexandre; Jouclas, Rémy; Guérin, David; Lemaur, Vincent; Schweicher, Guillaume; Lenfant, Stéphane; Antidormi, Aleandro; Geerts, Yves; Melis, Claudio; Cornil, Jerome; Vuillaume, Dominique |
| Contributors: |
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN); Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA); Université catholique de Lille (UCL)-Université catholique de Lille (UCL); Université de Mons = University of Mons (UMONS); Université libre de Bruxelles = Free University of Brussels (ULB); Centrale de Micro Nano Fabrication - IEMN (CMNF - IEMN); Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA); Nanostructures, nanoComponents & Molecules - IEMN (NCM - IEMN); Catalan Institute of Nanoscience and Nanotechnology = Institut Català de Nanociència i Nanotecnologia (ICN2); Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona (UAB)-Consejo Superior de Investigaciones Cientificas España = Spanish National Research Council Spain (CSIC)-Barcelona Institute of Science and Technology (BIST); International Solvay Institutes for Physics and Chemistry Brussels; Université libre de Bruxelles = Free University of Brussels (ULB)-Vrije Universiteit Brussel Bruxelles (VUB); Università degli Studi di Cagliari = University of Cagliari = Université de Cagliari (UniCa); ANR-16-CE05-0029,Harvesters,Récuperer l'energie thermique de l'environnement à l'aide d'un générateur thermoélectrique polymère pour alimenter un capteur autonome(2016) |
| Source: |
ISSN: 2040-3364. |
| Publisher Information: |
CCSD; Royal Society of Chemistry |
| Publication Year: |
2021 |
| Collection: |
Université Polytechnique Hauts-de-France: HAL |
| Subject Terms: |
organic thermoelectricity; organic semiconductor; approach to equilibrium molecular dynamics (AEMD); scanning thermal microscopy (SThM); thermal conducHvity; [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]; [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]; [PHYS]Physics [physics]; [SPI]Engineering Sciences [physics] |
| Description: |
International audience ; We study by scanning thermal microscopy the nanoscale thermal conductance of films (40-400 nm thick) of [1]benzothieno[3,2-b][1]benzothiophene (BTBT) and 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT-C8). We demonstrate that the out-of-plane thermal conductivity is significant along the interlayer direction, larger for BTBT (0.63 ± 0.12 W m -1 K -1 ) compared to C8-BTBT-C8 (0.25 ± 0.13 W m -1 K -1 ). These results are supported by molecular dynamics calculations (Approach to Equilibrium Molecular Dynamics method) performed on the corresponding molecular crystals. The calculations point to significant thermal conductivity (3D-like) values along the 3 crystalline directions, with anisotropy factors between the crystalline directions below 1.8 for BTBT and below 2.8 for C8-BTBT-C8, in deep contrast with the charge transport properties featuring a two-dimensional character for these materials. In agreement with the experiments, the calculations yield larger values in BTBT compared to C8-BTBT-C8 (0.6-1.3 W m -1 K -1 versus 0.3-0.7 W m -1 K -1 , respectively). The weak thickness dependence of the nanoscale thermal resistance is in agreement with a simple analytical model. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1039/D0NR08619C |
| Availability: |
https://hal.science/hal-03135025; https://hal.science/hal-03135025v1/document; https://hal.science/hal-03135025v1/file/SThM%20BTBT%20ArXiv.pdf; https://doi.org/10.1039/D0NR08619C |
| Rights: |
https://about.hal.science/hal-authorisation-v1/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.7F040F7B |
| Database: |
BASE |