Enabling high-mobility, ambipolar charge-transport in a DPP-benzotriazole copolymer by side-chain engineering

Mathias Gruber, Seok-Heon Jung, Sam Schott, Deepak Venkateshvaran, Auke Jisk Kronemeijer, Jens Wenzel Andreasen, Christopher R. McNeill, Wallace W H Wong, Munazza Shahid, Martin Heeney, Jin Kyun Lee, Henning Sirringhaus

Research output: Contribution to journalJournal articleResearchpeer-review

346 Downloads (Pure)

Abstract

In this article we discuss the synthesis of four new low band-gap co-polymers based on the diketopyrrolopyrrole (DPP) and benzotriazole (BTZ) monomer unit. We demonstrate that the BTZ unit allows for additional solubilizing side-chains on the co-monomer and show that the introduction of a linear side-chain on the DPP-unit leads to an increase in thin-film order and charge-carrier mobility if a sufficiently solubilizing, branched, side chain is attached to the BTZ. We compare two different synthetic routes, direct arylation and Suzuki-polycondensation, by a direct comparison of polymers obtained via the two routes and show that direct arylation produces polymers with lower electrical performance which we attribute to a higher density of chain Furthermore we demonstrate that a polymer utilizing this design motif and synthesized via Suzuki-polycondensation ((l-C18)-DPP-(b-C17)-BTZ) exhibits exceptionally high and near balanced average electron and hole mobilities >2 cm2 V-1 s-1 which are among the highest, robustly extracted mobility values reported for DPP copolymers in a top-gate configuration to date. Our results demonstrate clearly that linear side chain substitution of the DPP unit together with co-monomers that allow for the use of sufficiently long or branched solubilizing side chains can be an attractive design motif for solution processable, high mobility DPP copolymers.
Original languageEnglish
JournalChemical Science
Volume6
Issue number12
Pages (from-to)6949-6960
Number of pages12
ISSN2041-6520
DOIs
Publication statusPublished - 2015

Fingerprint Dive into the research topics of 'Enabling high-mobility, ambipolar charge-transport in a DPP-benzotriazole copolymer by side-chain engineering'. Together they form a unique fingerprint.

Cite this