Impact of Oligoether Side-Chain Length on the Thermoelectric Properties of a Polar Polythiophene
Artikel i vetenskaplig tidskrift, 2023
Conjugated polymers with oligoether side chains make up a promising class of thermoelectric materials. In this work, the impact of the side-chain length on the thermoelectric and mechanical properties of polythiophenes is investigated. Polymers with tri-, tetra-, or hexaethylene glycol side chains are compared, and the shortest length is found to result in thin films with the highest degree of order upon doping with the p-dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F(4)TCNQ). As a result, a stiff material with an electrical conductivity of up to 830 +/- 15 S cm(-1) is obtained, resulting in a thermoelectric power factor of about 21 mu W m(-1) K-2 in the case of as-cast films. Aging at ambient conditions results in an initial decrease in thermoelectric properties but then yields a highly stable performance for at least 3 months, with values of about 200 S cm(-1) and 5 mu W m(-1) K-2. Evidently, identification of the optimal side-chain length is an important criterion for the design of conjugated polymers for organic thermoelectrics.
conjugated polymer
organicthermoelectrics
chemical doping
electrical conductivity
side-chain length
Författare
Mariavittoria Craighero
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Jiali Guo
Consejo Superior de Investigaciones Científicas (CSIC)
Sepideh Zokaei
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Sophie Griggs
University of Oxford
Junfu Tian
University of Oxford
Jesika Asatryan
Universidade da Coruña
Joost Kimpel
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Renee Kroon
Linköpings universitet
Kai Xu
Consejo Superior de Investigaciones Científicas (CSIC)
Juan Sebastian Reparaz
Consejo Superior de Investigaciones Científicas (CSIC)
Jaime Martin
POLYMAT
Universidade da Coruña
Iain Mcculloch
University of Oxford
Mariano Campoy-Quiles
Consejo Superior de Investigaciones Científicas (CSIC)
Christian Müller
Chalmers, Kemi och kemiteknik, Tillämpad kemi
ACS Applied Electronic Materials
26376113 (eISSN)
Vol. In PressHybrid and Organic Thermoelectric Systems (HORATES)
Europeiska kommissionen (EU) (EC/H2020/955837), 2021-03-01 -- 2025-02-28.
Ämneskategorier
Polymerkemi
Oorganisk kemi
Annan materialteknik
DOI
10.1021/acsaelm.3c00936