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Título: | Thermal conductivity of benzothieno-benzothiophene derivatives at the nanoscale |
Autor: | Gueye, Magatte N.; Vercouter, Alexandre; Jouclas, Rémy; Guérin, David; Lemaur, Vincent; Schweicher, Guillaume; Lenfant, Stéphane; Antidormi, Aleandro CSIC ORCID; Geerts, Yves; Melis, Claudio; Cornil, Jérôme; Vuillaume, Dominique | Fecha de publicación: | 4-feb-2021 | Editor: | Royal Society of Chemistry (UK) | Citación: | Nanoscale 13(6): 3800-3807 (2021) | Resumen: | 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. This journal is | Versión del editor: | http://doi.org/10.1039/d0nr08619c | URI: | http://hdl.handle.net/10261/266086 | DOI: | 10.1039/d0nr08619c | Identificadores: | doi: 10.1039/d0nr08619c issn: 2040-3372 |
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