Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 27, Pages 32067-32074Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c04020
Keywords
organic thermoelectric; conjugated polymers; self-assembled monolayer; doping; charge carrier concentration
Funding
- National Natural Science Foundation of China [51603124, 21701029]
- Natural Science Foundation of Guangdong Province [2019A1515012179]
- Shenzhen Science and Technology Research Grants [JCYJ20180305124832322, ZDSYS201507141105130]
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Conjugated polymers are attracting attention for thermoelectric applications due to their diversity and low thermal conductivity. Modulating charge carrier concentration and improving power factor can be achieved by modifying the substrate with self-assembled monolayers.
Conjugated polymers have attracted considerable attention for thermoelectric applications in recent years due to their plentiful resources, diverse structures, mechanical flexibility, and low thermal conductivity. Herein, we demonstrate a new strategy of modulating charge carrier concentration of chemical-doped polymer films by modifying the substrate with self-assembled monolayers (SAMs). The SAM with a trifluoromethyl terminal group is found to accumulate holes in the polymer thin films, while the SAM with an amino terminal group tends to donate electrons to the polymer films. Thermoelectric thin films of conjugated donor-acceptor copolymer exhibit high power factors of 55.6-61.0 mu W m(-1) K-2 on SAMs with polar terminal groups. These power factors are 49% higher than that on the SAM with the nonpolar terminal group and 3 times higher than that on pristine substrate. The high power factor is ascribed to the modulated charge carrier concentration and improved charge carrier mobility as induced by SAMs.
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