Novel 4,8-Benzobisthiazole (BBT) copolymers and their application in OFET and OPV devices

Gary Conboy, Rupert G. D. Taylor, Neil J. Findlay, Alexander L. Kanibolotsky, Anto R. Inigo, Sanjay S. Ghosh, Bernd Ebenhoch, Lethy K. Jagadamma, Gopala Krishna V. V. Thalluri, Muhammad T. Sajjad, Ifor D. W. Samuel, Peter J. Skabara

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Abstract

A series of 4,8-benzobisthiazole (BBT) containing copolymers with bisthienyl-diketopyrrolopyrrole (DPP), dithienopyrrole (DTP), benzothiadiazole (BT), benzodithiophene (BDT) or 4,4’-dialkoxybithiazole (BTz) comonomers were designed and synthesised. The resulting polymers possess a conjugation pathway that is orthogonal to the traditional 2,6-BBT unit, facilitating intramolecular non-covalent interaction between strategically placed heteroatoms of neighbouring monomer units. Such interactions enable a control over the degree of planarity through altering the number and strength of non-covalent interactions, in turn allowing for tuning of the band gap. Incorporation of the 4,8-BBT copolymers as donor material in organic photovoltaic (OPV) and p-type semiconductors in organic field effect transistor (OFET) devices gave performances up to 4.45% and 3.06 × 10-2 cm2 V-1 s-1 for pBT2ThBBT and pDPP2ThBBT respectively.
Original languageEnglish
Number of pages10
JournalJournal of Materials Chemistry. C
Early online date13 Nov 2017
DOIs
Publication statusE-pub ahead of print - 13 Nov 2017

Keywords

  • donor–acceptor copolymer
  • benzobisthiazole
  • organic field effect transistor
  • hole mobility
  • organic photovoltaics

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