Dithiopheneindenofluorene (TIF) Semiconducting Polymers with Very High Mobility in Field-Effect Transistors

Hu Chen, Michael Hurhangee, Mark Nikolka, Weimin Zhang, Mindaugas Kirkus, Marios Neophytou, Samuel J. Cryer, David Harkin, Pascal Hayoz, Mojtaba Abdi-Jalebi, Christopher R. McNeill, Henning Sirringhaus, Iain McCulloch

Research output: Contribution to journalArticlepeer-review

84 Scopus citations


The charge-carrier mobility of organic semiconducting polymers is known to be enhanced when the energetic disorder of the polymer is minimized. Fused, planar aromatic ring structures contribute to reducing the polymer conformational disorder, as demonstrated by polymers containing the indacenodithiophene (IDT) repeat unit, which have both a low Urbach energy and a high mobility in thin-film-transistor (TFT) devices. Expanding on this design motif, copolymers containing the dithiopheneindenofluorene repeat unit are synthesized, which extends the fused aromatic structure with two additional phenyl rings, further rigidifying the polymer backbone. A range of copolymers are prepared and their electrical properties and thin-film morphology evaluated, with the co-benzothiadiazole polymer having a twofold increase in hole mobility when compared to the IDT analog, reaching values of almost 3 cm2 V−1 s−1 in bottom-gate top-contact organic field-effect transistors.
Original languageEnglish (US)
Pages (from-to)1702523
JournalAdvanced Materials
Issue number36
StatePublished - Jul 21 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors thank KAUST and BASF for financial support and
acknowledge EC FP7 Project SC2 (610115) EC H2020 Project
SOLEDLIGHT (643791), and EPSRC Projects EP/G037515/1 and
EP/M005143/1. M.N. and H.S. acknowledge financial support from
the Engineering and Physical Sciences Research Council through a
Programme Grant (EP/M005141/1). M.A.J. gratefully acknowledges
Nava Technology Limited for a Ph.D. scholarship. The authors also
thank Mr. James Fraser for the help of synthesizing several intermediates
and Dr. Aditya Sadhanala for help with PDS measurements. C.R.M.
also acknowledges support from the Australian Research Council
(DP130102616). This research was undertaken in part on the SAXS/
WAXS beamline[26] at the Australian Synchrotron, Victoria, Australia.


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