Back to Search
Start Over
Strong Suppression of Thermal Conductivity in the Presence of Long Terminal Alkyl Chains in Low-Disorder Molecular Semiconductors
- Source :
- Advanced materials, 33 (37, Digital.CSIC. Repositorio Institucional del CSIC, instname
- Publication Year :
- 2021
-
Abstract
- Funder: Consortium des Équipements de Calcul Intensif<br />Funder: The Leverhulme Trust<br />While the charge transport properties of organic semiconductors have been extensively studied over the recent years, the field of organics‐based thermoelectrics is still limited by a lack of experimental data on thermal transport and of understanding of the associated structure–property relationships. To fill this gap, a comprehensive experimental and theoretical investigation of the lattice thermal conductivity in polycrystalline thin films of dinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (Cn‐DNTT‐Cn with n = 0, 8) semiconductors is reported. Strikingly, thermal conductivity appears to be much more isotropic than charge transport, which is confined to the 2D molecular layers. A direct comparison between experimental measurements (3ω–Völklein method) and theoretical estimations (approach‐to‐equilibrium molecular dynamics (AEMD) method) indicates that the in‐plane thermal conductivity is strongly reduced in the presence of the long terminal alkyl chains. This evolution can be rationalized by the strong localization of the intermolecular vibrational modes in C8‐DNTT‐C8 in comparison to unsubstituted DNTT cores, as evidenced by a vibrational mode analysis. Combined with the enhanced charge transport properties of alkylated DNTT systems, this opens the possibility to decouple electron and phonon transport in these materials, which provides great potential for enhancing the thermoelectric figure of merit ZT.
- Subjects :
- Materials science
Phonon
Molecular dynamics
Thermal conductivity
Chimie
General Materials Science
thermal conductivity
organic semiconductors
Alkyl
Research Articles
chemistry.chemical_classification
Thermoelectrics
business.industry
Physique
Mechanical Engineering
Intermolecular force
Thermoelectric materials
molecular dynamics
Organic semiconductor
Semiconductor
chemistry
Mechanics of Materials
Chemical physics
Molecular vibration
Organic semiconductors
business
thermoelectrics
Research Article
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Advanced materials, 33 (37, Digital.CSIC. Repositorio Institucional del CSIC, instname
- Accession number :
- edsair.doi.dedup.....ce8f72edce339b47905672fa6678a3ad