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dc.contributor.authorGiovannitti, Alexander
dc.contributor.authorThorley, Karl J.
dc.contributor.authorNielsen, Christian B.
dc.contributor.authorLi, Jun
dc.contributor.authorDonahue, Mary J.
dc.contributor.authorMalliaras, George G.
dc.contributor.authorRivnay, Jonathan
dc.contributor.authorMcCulloch, Iain
dc.date.accessioned2018-03-11T06:54:14Z
dc.date.available2018-03-11T06:54:14Z
dc.date.issued2018-02-23
dc.identifier.citationGiovannitti A, Thorley KJ, Nielsen CB, Li J, Donahue MJ, et al. (2018) Redox-Stability of Alkoxy-BDT Copolymers and their Use for Organic Bioelectronic Devices. Advanced Functional Materials: 1706325. Available: http://dx.doi.org/10.1002/adfm.201706325.
dc.identifier.issn1616-301X
dc.identifier.doi10.1002/adfm.201706325
dc.identifier.urihttp://hdl.handle.net/10754/627277
dc.description.abstractOrganic semiconductors can be employed as the active layer in accumulation mode organic electrochemical transistors (OECTs), where redox stability in aqueous electrolytes is important for long-term recordings of biological events. It is observed that alkoxy-benzo[1,2-b:4,5-b′]dithiophene (BDT) copolymers can be extremely unstable when they are oxidized in aqueous solutions. The redox stability of these copolymers can be improved by molecular design of the copolymer where it is observed that the electron rich comonomer 3,3′-dimethoxy-2,2′-bithiophene (MeOT2) lowers the oxidation potential and also stabilizes positive charges through delocalization and resonance effects. For copolymers where the comonomers do not have the same ability to stabilize positive charges, irreversible redox reactions are observed with the formation of quinone structures, being detrimental to performance of the materials in OECTs. Charge distribution along the copolymer from density functional theory calculations is seen to be an important factor in the stability of the charged copolymer. As a result of the stabilizing effect of the comonomer, a highly stable OECT performance is observed with transconductances in the mS range. The analysis of the decomposition pathway also raises questions about the general stability of the alkoxy-BDT unit, which is heavily used in donor-acceptor copolymers in the field of photovoltaics.
dc.description.sponsorshipThe authors thank King Abdullah University of Science and Technology, Badische Anilin and Soda Fabrik, Engineering and Physical Sciences Research Council Project EP/G037515/1, EP/M005143/1, EP/N509486/1, EC FP7 Project SC2 (610115), and EC H2020 Project SOLEDLIGHT (643791) for the financial support.
dc.publisherWiley
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/adfm.201706325/full
dc.relation.urlhttps://qmro.qmul.ac.uk/xmlui/bitstream/123456789/34983/1/Nielsen%20Redox-Stability%20of%20Alkoxy%202018%20Accepted.pdf
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
dc.rightsThis file is an open access version redistributed from: https://qmro.qmul.ac.uk/xmlui/bitstream/123456789/34983/1/Nielsen%20Redox-Stability%20of%20Alkoxy%202018%20Accepted.pdf
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectOrganic bioelectronics
dc.subjectOrganic electrochemical transistors
dc.subjectOrganic semiconductors
dc.subjectQuinones
dc.subjectStability
dc.titleRedox-Stability of Alkoxy-BDT Copolymers and their Use for Organic Bioelectronic Devices
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalAdvanced Functional Materials
dc.rights.embargodate2019-02-23
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Chemistry and Centre for Plastic Electronics Imperial College London Exhibition Road London SW7 2AZ UK
dc.contributor.institutionMaterials Research Institute and School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK
dc.contributor.institutionDepartment of Bioelectronics École Nationale Supérieure des Mines CMP-EMSE MOC Gardanne 13541 France
dc.contributor.institutionElectrical Engineering Division University of Cambridge 9 JJ Thomson Ave Cambridge CB3 0FA UK
dc.contributor.institutionSimpson Querrey Institute Northwestern University 303 E, Superior, Suite 11-131 Chicago 60611IL USA
dc.contributor.institutionDepartment of Biomedical Engineering Northwestern University 2145 Sheridan Road Evanston 60208-3109IL USA
kaust.personMcCulloch, Iain
refterms.dateFOA2020-01-23T05:44:56Z
dc.date.published-online2018-02-21
dc.date.published-print2018-04


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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Except where otherwise noted, this item's license is described as This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.