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dc.contributor.authorGiovannitti, Alexander
dc.contributor.authorSbircea, Dan Tiberiu
dc.contributor.authorInal, Sahika
dc.contributor.authorNielsen, Christian B.
dc.contributor.authorBandiello, Enrico
dc.contributor.authorHanifi, David A.
dc.contributor.authorSessolo, Michele
dc.contributor.authorMalliaras, George G.
dc.contributor.authorMcCulloch, Iain
dc.contributor.authorRivnay, Jonathan
dc.date.accessioned2017-01-02T09:28:28Z
dc.date.available2017-01-02T09:28:28Z
dc.date.issued2016-10-10
dc.identifier.citationGiovannitti A, Sbircea D-T, Inal S, Nielsen CB, Bandiello E, et al. (2016) Controlling the mode of operation of organic transistors through side-chain engineering. Proceedings of the National Academy of Sciences 113: 12017–12022. Available: http://dx.doi.org/10.1073/pnas.1608780113.
dc.identifier.issn0027-8424
dc.identifier.issn1091-6490
dc.identifier.doi10.1073/pnas.1608780113
dc.identifier.urihttp://hdl.handle.net/10754/622387
dc.description.abstractElectrolyte-gated organic transistors offer low bias operation facilitated by direct contact of the transistor channel with an electrolyte. Their operation mode is generally defined by the dimensionality of charge transport, where a field-effect transistor allows for electrostatic charge accumulation at the electrolyte/semiconductor interface, whereas an organic electrochemical transistor (OECT) facilitates penetration of ions into the bulk of the channel, considered a slow process, leading to volumetric doping and electronic transport. Conducting polymer OECTs allow for fast switching and high currents through incorporation of excess, hygroscopic ionic phases, but operate in depletion mode. Here, we show that the use of glycolated side chains on a thiophene backbone can result in accumulation mode OECTs with high currents, transconductance, and sharp subthreshold switching, while maintaining fast switching speeds. Compared with alkylated analogs of the same backbone, the triethylene glycol side chains shift the mode of operation of aqueous electrolyte-gated transistors from interfacial to bulk doping/transport and show complete and reversible electrochromism and high volumetric capacitance at low operating biases. We propose that the glycol side chains facilitate hydration and ion penetration, without compromising electronic mobility, and suggest that this synthetic approach can be used to guide the design of organic mixed conductors.
dc.description.sponsorshipWe thank I. Uguz (CMP-EMSE) for fruitful discussion and help in fabrication. This work was carried out with financial support from European Commission (EC) FP7 Project SC2 (610115), EC FP7 Project ArtESun (604397), EC FP7 Project PolyMed (612538), and Engineering and Physical Sciences Research Council (EPSRC) Project EP/G037515/1. E.B. thanks the Spanish Ministry of Economy and Competitiveness for his predoctoral contract. M.S. acknowledges support from the first edition of the BBVA Foundation Grants for Researchers and Cultural Creators.
dc.publisherProceedings of the National Academy of Sciences
dc.relation.urlhttp://www.pnas.org/content/113/43/12017
dc.subjectorganic electronics
dc.subjectelectrochemical transistor
dc.subjectsemiconducting polymers
dc.titleControlling the mode of operation of organic transistors through side-chain engineering
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentBioscience Program
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalProceedings of the National Academy of Sciences
dc.contributor.institutionDepartment of Chemistry and Centre for Plastic Electronics, Imperial College London, London SW7 2AZ, United Kingdom
dc.contributor.institutionDepartment of Bioelectronics, École Nationale Supérieure des Mines de Saint-Etienne, Centre Microélectronique de Provence (CMP-EMSE), Microelectronique et Objects Communicants, 13541 Gardanne, France
dc.contributor.institutionMaterials Research Institute and School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
dc.contributor.institutionInstituto de Ciencia Molecular, Universidad de Valencia, Paterna 46980, Spain
dc.contributor.institutionDepartment of Chemistry, Stanford University, Stanford, CA 94305
dc.contributor.institutionPalo Alto Research Center–a Xerox company, Palo Alto, CA 94304
kaust.personInal, Sahika
kaust.personMcCulloch, Iain
dc.date.published-online2016-10-10
dc.date.published-print2016-10-25


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