| Title: |
Thermal conductivity of benzothieno-benzothiophene derivatives at the nanoscale |
| Authors: |
Gueye, Magatte Niang; Vercouter, Alexandre; Jouclas, Rémy; Guerin, David; Lemaur, Vincent; Schweicher, Guillaume; Lenfant, Stephane; Antidormi, Aleandro; Geerts, Yves Henri; Melis, Claudio; Cornil, Jerome; Vuillaume, Dominique |
| Publication Year: |
2021 |
| Collection: |
Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB |
| Subject Terms: |
Anisotropy factor; Approach to equilibrium; Benzothiophene derivatives; Crystalline directions; Molecular dynamics calculation; Scanning thermal microscopy; Thermal conductance; Thickness dependence |
| Description: |
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-1versus 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 |
| File Description: |
application/pdf |
| Language: |
English |
| ISBN: |
978-85-10-12585-7; 85-10-12585-6 |
| ISSN: |
20403372 |
| Relation: |
Nanoscale; Vol. 13, issue 6 (Feb. 2021), p. 3800-3807; https://ddd.uab.cat/record/241023; urn:10.1039/d0nr08619c; urn:oai:ddd.uab.cat:241023; urn:scopus_id:85101258563; urn:articleid:20403372v13n6p3800; urn:icn2uab:6479544 |
| Availability: |
https://ddd.uab.cat/record/241023 |
| Rights: |
open access ; Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets. ; https://rightsstatements.org/vocab/InC/1.0/ |
| Accession Number: |
edsbas.26B72B64 |
| Database: |
BASE |