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Polyterthiophenes incorporating 3,4-difluorothiophene units : application in organic field-effect transistors

Crouch, David J. and Sparrowe, David and Heeney, Martin and McCulloch, Iain and Skabara, Peter (2010) Polyterthiophenes incorporating 3,4-difluorothiophene units : application in organic field-effect transistors. Macromolecular Chemistry and Physics, 211 (24). pp. 2642-2648. ISSN 1022-1352

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    Two terthiophenes bearing core fluorinated thienyl units have been synthesised as potential semiconductor materials for organic field-effect transistors. Polymerisation of these compounds has been achieved using conventional iron(III) chloride oxidative coupling methods and by electrochemical oxidation. Characterisation of the fluorinated materials has been achieved by absorption spectroscopy and cyclic voltammetry. A soluble hexyl-functionalised polymer (poly8b) was used in an OFET device; hole mobilities were measured up to 3 × 10−3 cm2 · V−1 · s−1, and the device had an on/off ratio of 105 and a turn-on voltage of +4 V.