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Conjugated Polymer Blends for Organic Thermoelectrics
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7104-7127
2019 (English)In: ADVANCED ELECTRONIC MATERIALS, ISSN 2199-160X, Vol. 5, no 11, article id 1800821Article in journal (Refereed) Published
Abstract [en]

A major attraction of organic conjugated semiconductors is that materials with new, emergent functionality can be designed and made by simple blending, as is extensively used in, e.g., bulk heterojunction organic solar cells. Herein doped blends based on organic semiconductors (OSCs) for thermoelectric applications are critically reviewed. Several experimental strategies to improve thermoelectric performance, measured in terms of power factor (PF) or figure-of-merit ZT, have been demonstrated in recent literature. Specifically, density-of-states design in blends of two OSCs can be used to obtain electronic Seebeck coefficients up to approximate to 2000 mu V K-1. Alternatively, blending with (high-dielectric constant) insulating polymers can improve doping efficiency and thereby conductivity, as well as induce more favorable morphologies that improve conductivity while hardly affecting thermopower. In the PEDOT:polystyrene-sulfonate (PEDOT:PSS) blend system, processing schemes to either improve conductivity via morphology or via (partial) removal of the electronically isolating PSS, or both, have been demonstrated. Although a range of experiments have at least quasi-quantitatively been explained by analytical or numerical models, a comprehensive model for organic thermoelectrics is lacking so far.

Place, publisher, year, edition, pages
WILEY , 2019. Vol. 5, no 11, article id 1800821
Keywords [en]
blending; charge transport models; conjugated polymers; organic thermoelectrics; Seebeck coefficient
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-162544DOI: 10.1002/aelm.201800821ISI: 000496244000008OAI: oai:DiVA.org:liu-162544DiVA, id: diva2:1376281
Available from: 2019-12-09 Created: 2019-12-09 Last updated: 2020-01-15

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