Modification of Indacenodithiophene-Based Polymers and Its Impact on Charge Carrier Mobility in Organic Thin-Film Transistors.

Andrew Wadsworth, Hu Chen, Karl J Thorley, Camila Cendra, Mark Nikolka, Helen Bristow, Maximilian Moser, Alberto Salleo, Thomas D. Anthopoulos, Henning Sirringhaus, Iain McCulloch

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The polymer indacenodithiophene-co-benzothiadiazole (IDT-BT) has been thoroughly studied for its use in p-type organic thin-film transistors over the course of the past decade. While a variety of modifications have been made to its structure, few analogues have been able to match or surpass the hole mobility that can be obtained by IDT-BT. Here, we discuss the rationale behind the chemical modifications that have been utilized and suggest design principles toward high-mobility indacenodithiophene-based polymers. It is clear that planarizing intramolecular interactions, which exist between the peripheral thiophene of the IDT unit and the benzothiadiazole, are imperative for achieving high hole mobilities in this relatively amorphous polymer. Moreover, despite the less ordered backbones of the extended fused-ring cores that have recently been utilized (TIF-BT and TBIDT-BT), high mobilities were still attained in these polymers owing to additional interchain charge transfer. Thus, maintaining the beneficial thiophene-benzothiadiazole intramolecular interactions, while further extending the IDT core to promote interchain charge transfer, is a logical strategy toward high-mobility p-type polymers.
Original languageEnglish (US)
Pages (from-to)652-664
Number of pages13
JournalJournal of the American Chemical Society
Volume142
Issue number2
DOIs
StatePublished - Dec 18 2019

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