The Role of Ordering on the Thermoelectric Properties of Blends of Regioregular and Regiorandom Poly(3‐hexylthiophene)

Lim, Eunhee; Glaudell, Anne M.; Miller, Rachel; Chabinyc, Michael L.

doi:10.1002/aelm.201800915

Title: The Role of Ordering on the Thermoelectric Properties of Blends of Regioregular and Regiorandom Poly(3‐hexylthiophene)

Journal Article · Thu Apr 25 00:00:00 EDT 2019 · Advanced Electronic Materials

DOI:https://doi.org/10.1002/aelm.201800915· OSTI ID:1508864

Lim, Eunhee ^[1]; Glaudell, Anne M. ^[1];

^[2];

^[1]

Materials Department University of California Santa Barbara CA 93106 USA
Department of Materials Science and Engineering Cornell University Ithaca NY 14850 USA

Abstract The thermoelectric properties of semiconducting polymers are influenced by both the carrier concentration and the morphology that sets the pathways for charge transport. A combination of optical, morphological, and electrical characterization is used to assess the effect of the role of disorder on the thermoelectric properties of thin films of poly(3‐hexylthiophene) (P3HT) doped with 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F ₄ TCNQ). Controlled morphologies are formed by casting blends of regioregular (RR‐P3HT) and regiorandom (RRa‐P3HT) and then subsequently doped with F ₄ TCNQ from the vapor phase. Optical spectroscopy and X‐ray scattering show that vapor phase doping induces order in the disordered regions of thin films and increases the long‐range connectivity of the film. The thermoelectric properties are assessed as a function of composition and it is shown that while the Seebeck coefficient is affected by structural ordering, the electrical conductivity and power factor are more strongly correlated with the long‐range connectivity of ordered domains.

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Sponsoring Organization:: USDOE

OSTI ID:: 1508864

Journal Information:: Advanced Electronic Materials, Journal Name: Advanced Electronic Materials Vol. 5 Journal Issue: 11; ISSN 2199-160X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 52 works

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