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dc.contributor.authorHuang, Yuxuan
dc.contributor.authorLukito Tjhe, Dionisius Hardjo
dc.contributor.authorJacobs, Ian
dc.contributor.authorJiao, Xuechen
dc.contributor.authorHe, Qiao
dc.contributor.authorStatz, Martin
dc.contributor.authorRen, Xinglong
dc.contributor.authorHuang, Xinyi
dc.contributor.authorMcCulloch, Iain
dc.contributor.authorHeeney, Martin
dc.contributor.authorMcNeill, Christopher R.
dc.contributor.authorSirringhaus, Henning
dc.date.accessioned2021-09-19T11:51:21Z
dc.date.available2021-09-19T11:51:21Z
dc.date.issued2021-09-13
dc.date.submitted2021-05-04
dc.identifier.citationHuang, Y., Lukito Tjhe, D. H., Jacobs, I. E., Jiao, X., He, Q., Statz, M., … Sirringhaus, H. (2021). Design of experiment optimization of aligned polymer thermoelectrics doped by ion-exchange. Applied Physics Letters, 119(11), 111903. doi:10.1063/5.0055886
dc.identifier.issn0003-6951
dc.identifier.issn1077-3118
dc.identifier.doi10.1063/5.0055886
dc.identifier.urihttp://hdl.handle.net/10754/671298
dc.description.abstractOrganic thermoelectrics offer the potential to deliver flexible, low-cost devices that can directly convert heat to electricity. Previous studies have reported high conductivity and thermoelectric power factor in the conjugated polymer poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (PBTTT). Here, we investigate the thermoelectric properties of PBTTT films in which the polymer chains were aligned uniaxially by mechanical rubbing, and the films were doped by a recently developed ion exchange technique that provides a choice over the counterions incorporated into the film, allowing for more optimized morphology and better stability than conventional charge transfer doping. To optimize the polymer alignment process, we took advantage of two Design of Experiment (DOE) techniques: regular two-level factorial design and central composite design. Rubbing temperature Trub and post-alignment annealing temperature Tanneal were the two factors that were most strongly correlated with conductivity. We were able to achieve high polymer alignment with a dichroic ratio >15 and high electrical conductivities of up to 4345 S/cm for transport parallel to the polymer chains, demonstrating that the ion exchange method can achieve conductivities comparable/higher than conventional charge transfer doping. While the conductivity of aligned films increased by a factor of 4 compared to unaligned films, the Seebeck coefficient (S) remained nearly unchanged. The combination of DOE methodology, high-temperature rubbing, and ion exchange doping provides a systematic, controllable strategy to tune structure–thermoelectric property relationships in semiconducting polymers
dc.publisherAIP Publishing
dc.relation.urlhttps://aip.scitation.org/doi/10.1063/5.0055886
dc.rightsAll article content, except where otherwise noted, is licensed under a Creative Commons Attribution
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleDesign of experiment optimization of aligned polymer thermoelectrics doped by ion-exchange
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalApplied Physics Letters
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionOptoelectronics Group, Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom
dc.contributor.institutionDepartment of Materials Science and Engineering, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
dc.contributor.institutionDepartment of Chemistry and Centre for Processable Electronics, Imperial College London, London, United Kingdom
dc.contributor.institutionGeorg-August-Universität Göttingen, I. Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
dc.contributor.institutionSchool of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
dc.contributor.institutionDepartment of Chemistry, University of Oxford, Oxford, United Kingdom
dc.identifier.volume119
dc.identifier.issue11
dc.identifier.pages111903
kaust.personMcCulloch, Iain
dc.date.accepted2021-08-05
refterms.dateFOA2021-09-19T11:52:47Z


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