Unraveling the Unconventional Order of a High-Mobility Indacenodithiophene–Benzothiadiazole Copolymer

Camila Cendra, Luke Balhorn, Weimin Zhang, Kathryn O’Hara, Karsten Bruening, Christopher J. Tassone, Hans-Georg Steinrück, Mengning Liang, Michael F. Toney, Iain McCulloch, Michael L Chabinyc, Alberto Salleo, Christopher J. Takacs

Research output: Contribution to journalArticlepeer-review

Abstract

A new class of donor–acceptor (D–A) copolymers found to produce high charge carrier mobilities competitive with amorphous silicon (>1 cm2 V–1 s–1) exhibit the puzzling microstructure of substantial local order, however lacking long-range order and crystallinity previously deemed necessary for achieving high mobility. Here, we demonstrate the application of low-dose transmission electron microscopy to image and quantify the nanoscale and mesoscale organization of an archetypal D–A copolymer across areas comparable to electronic devices (≈9 μm2). The local structure is spatially resolved by mapping the backbone (001) spacing reflection, revealing nanocrystallites of aligned polymer chains throughout nearly the entire film. Analysis of the nanoscale structure of its ordered domains suggests significant short- and medium-range order and preferential grain boundary orientations. Moreover, we provide insights into the rich, interconnected mesoscale organization of this new family of D–A copolymers by analysis of the local orientational spatial autocorrelations.
Original languageEnglish (US)
Pages (from-to)1306-1314
Number of pages9
JournalACS Macro Letters
DOIs
StatePublished - Oct 5 2021

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics

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