Picture of a black hole

Strathclyde Open Access research that creates ripples...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of research papers by University of Strathclyde researchers, including by Strathclyde physicists involved in observing gravitational waves and black hole mergers as part of the Laser Interferometer Gravitational-Wave Observatory (LIGO) - but also other internationally significant research from the Department of Physics. Discover why Strathclyde's physics research is making ripples...

Strathprints also exposes world leading research from the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

Thiophene and selenophene copolymers incorporating fluorinated phenylene units in the main chain: Synthesis, characterization, and application in organic field-effect transistors

Crouch, D.J. and Skabara, P.J. and Lohr, J.E. and McDouall, J.J.W. and Heeney, M. and McCulloch, I. and Sparrowe, D. and Shkunov, M. and Coles, S.J. and Horton, P.N. and Hursthouse, M.B. (2005) Thiophene and selenophene copolymers incorporating fluorinated phenylene units in the main chain: Synthesis, characterization, and application in organic field-effect transistors. Chemistry of Materials, 17 (26). pp. 6567-6578. ISSN 0897-4756

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

A series of thiophene oligomers bearing core phenylene and fluorinated phenylene units has been synthesized as potential semiconductor materials for organic field-effect transistors (OFETs). Polymerization of these compounds has been achieved using Stille and oxidative Coupling methods. Functionalization of the phenylene unit with fluorine atoms has a marked effect on the self-assembly and electronic properties of the parent materials: the optical band gaps and highest occupied molecular orbital levels are affected with the introduction Of fluorine atoms as a result of a combination of inductive effects and rigidification of the main chain. The design of these materials has focused on the self-assembly and solution processability of the materials. All the polymers are readily Soluble in common organic solvents. Self-assembly and planarization of the fluorinated materials in the solid state are identified by a combination of X-ray diffraction studies, absorption spectroscopy, and cyclic voltammetry. The organizational behavior of the films is in contrast to the conformational freedom observed in solution (absorption spectroscopy) and in the gas phase (computational Studies). Thin-film OFETs have been fabricated for the entire polymer series. Hole mobilities have been measured Lip to 10(-3) cm(2)/(V(.)s), with high current modulation (on/off ratios up to 10(5)) and low turn-on voltages (down to 2 V). For the Stille Coupled polymers, replacement of the bridging thiophene unit with selenophene generally increases the hole mobility of the polymers.