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

Conboy, Gary and Taylor, Rupert G. D. and Findlay, Neil J. and Kanibolotsky, Alexander L. and Inigo, Anto R. and Ghosh, Sanjay S. and Ebenhoch, Bernd and Jagadamma, Lethy K. and Thalluri, Gopala Krishna V. V. and Sajjad, Muhammad T. and Samuel, Ifor D. W. and Skabara, Peter J. (2017) Novel 4,8-Benzobisthiazole (BBT) copolymers and their application in OFET and OPV devices. Journal of Materials Chemistry. C. ISSN 2050-7526

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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.