Improving mobility and electrochemical stability of a water-gated polymer field-effect transistor |
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| Affiliation: | 1. Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133 Milan, Italy;2. Dipartimento di Fisica, Politecnico di Milano, P.zza L. da Vinci 32, 20133 Milan, Italy;1. Department of Science and Technology (ITN), Linköpings Universitet, Campus Norrköping, Bredgatan 34, 601 74 Norrköping, Sweden;2. Univ. Paris Diderot, Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75205 Paris Cedex 13, France;3. LPICM, UMR CNRS 7647, Ecole Polytechnique, Route de Saclay, 91128 Palaiseau, France;1. Department of Electrical & Electronics Engineering, Bogazici University, Istanbul, Turkey;2. Department of Chemistry, Bogazici University, Istanbul, Turkey;1. Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin, Gyeonggi-do 446-701, Republic of Korea;2. Department of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shilim-9-Dong, Gwanak-Gu, Seoul 151-744, Republic of Korea;3. Interface Material and Chemical Engineering Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-343, Republic of Korea;1. Technische Universität München, Institute for Nanoelectronics, Arcisstraße 21, 80333 München, Germany;2. University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093 Warsaw, Poland;1. Department of Advanced Science and Engineering, Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-855, Japan;2. Department of Chemistry and Biochemistry, Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-855, Japan;1. Department of Materials Science and Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK;2. National EPSRC XPS Users’ Service, School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK |
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| Abstract: | Water-gated organic transistors have attracted considerable attention in the field of biosensors, thanks to their capability of operating in the aqueous environment typical of biological systems at very low voltages (∼1 V). Some examples have been recently reported in the literature, employing different organic materials as the active semiconducting layer, ranging from small molecules to single crystals. Here we report on water-gated polymer-based organic-field effect devices using poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) (pBTTT) as the active layer. Very promising electronic performances, in terms of mobility and operating voltages are obtained; notably, the charge carrier mobility is in the order of 0.08 cm2/V s, which is of the same order of magnitude of values reported for single-crystal based water-gated devices, and consistent with values reported for solid-state polymer dielectric transistors. Moreover, the pBTTT-based device shows improved electrochemical stability, as compared to previously reported polymer based water-gated devices. Importantly, good functioning of the device is demonstrated also when water is replaced by physiological-like solutions. Critical to the transistors operation, besides the good transport properties of the active material, is the key-role played by alkyl side chains and ordered morphology of the polymer at the interface with the liquid environment, which we highlight here for the first time. Our contribution overall provides a useful step towards the development of bio-organic sensors, with enhanced properties in terms of sensitivity and stability, and for a successful exploitation of organic based field effect transistors in biotic/abiotic interfaces. |
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| Keywords: | Organic transistor Water-gated transistor Electrolyte-gated transistor pBTTT Semiconducting polymer Bioelectronics |
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