Dependence of crystallite formation and preferential backbone orientations on the side chain pattern in PBDTTPD polymers

Abdulrahman El Labban, Julien Warnan, Clement Cabanetos, Olivier Ratel, Christopher J. Tassone, Michael F. Toney, Pierre Beaujuge

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

(Figure Presented) Alkyl substituents appended to the π-conjugated main chain account for the solution-processability and film-forming properties of most π-conjugated polymers for organic electronic device applications, including field-effect transistors (FETs) and bulk-heterojunction (BHJ) solar cells. Beyond film-forming properties, recent work has emphasized the determining role that side-chain substituents play on polymer self-assembly and thin-film nanostructural order, and, in turn, on device performance. However, the factors that determine polymer crystallite orientation in thin-films, implying preferential backbone orientation relative to the device substrate, are a matter of some debate, and these structural changes remain difficult to anticipate. In this report, we show how systematic changes in the side-chain pattern of poly(benzo[1,2-b:4,5-b′]dithiophene-alt-thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymers can (i) influence the propensity of the polymer to order in the π-stacking direction, and (ii) direct the preferential orientation of the polymer crystallites in thin films (e.g., "face-on" vs "edge-on"). Oriented crystallites, specifically crystallites that are well-ordered in the π-stacking direction, are believed to be a key contributor to improved thin-film device performance in both FETs and BHJ solar cells.
Original languageEnglish (US)
Pages (from-to)19477-19481
Number of pages5
JournalACS Applied Materials & Interfaces
Volume6
Issue number22
DOIs
StatePublished - Nov 6 2014

ASJC Scopus subject areas

  • Materials Science(all)

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