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Advantageous thermoelectric properties of a semimetallic polymer
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Functional Electronic Materials. Linköping University, The Institute of Technology.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Thermoelectric generation potentially holds a solution for waste heat recovery issues provided that the availability of inexpensive, biodegradable and highly efficient thermoelectric materials is insured in the near future. Plastic thermoelectrics could successfully comply with the said requirements if the thermoelectric efficiency (ZT) of conducting polymers was higher. However, given the novelty of the subject, at present there are no clear guidelines for ZT optimization in this class of materials. The most important piece of information that is currently missing is the description of a specific electronic makeup that conducting polymers must possess in order to enable good thermoelectric performance. In the present study the thermoelectric properties of poly(3,4-ethylenedioxythiophene) derivatives with two types of counterions, i.e. poly(styrenesulfonate) (PSS) and tosylate (Tos) are evaluated. A striking variation in their thermoelectric performance is attributed to structural and morphological differences between two polymers that manifest itself in dissimilar charge transport mechanism. The superior properties of PEDOT-Tos presumably originate from a high degree of crystallinity and structural order that predetermines the tendency for bipolaron band formation. Unlike polaronic PEDOT-PSS with slowly varying density of localized states (DOS) near the Fermi level (EF), the DOS in PEDOT-Tos is characterized by higher asymmetry and higher charge carrier density at EF (similar to semimetals), which allows for higher thermopower and electrical conductivity. Therefore, we conclude that the polymers with semimetallic electronic makeup are expected to exhibit promising thermoelectric properties with bigger variation in thermopower upon doping.

Keyword [en]
Thermoelectric, semimetal, conducting polymer, bipolaron
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-87454OAI: oai:DiVA.org:liu-87454DiVA: diva2:589456
Available from: 2014-05-31 Created: 2013-01-18 Last updated: 2017-02-03Bibliographically approved

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Bubnova, OlgaUllah Khan, ZiaWang, HuiDagnelund, DanielZozoulenko, IgorBerggren, MagnusCrispin, Xavier

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Bubnova, OlgaUllah Khan, ZiaWang, HuiDagnelund, DanielZozoulenko, IgorBerggren, MagnusCrispin, Xavier
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Physics and ElectronicsThe Institute of TechnologyFunctional Electronic Materials
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