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Keywords:

  • charge transfer;
  • conjugated polymers;
  • copolymer;
  • diketopyrrolopyrrole;
  • films;
  • naphtodithiophene;
  • organic thin-film transistor;
  • thin films;
  • semiconductor;
  • synthesis

ABSTRACT

Novel naphtho[1,2-b:5,6-b′]dithiophene (NDT) and diketopyrrolopyrrole (DPP)-containing donor-acceptor conjugated polymers (PNDTDPPs) with different branched side chains were synthesized via Pd(0)-catalyzed Stille coupling reaction. Octyldodecyl (OD) and dodecylhexadecyl (DH) groups were tethered to the DPP units as the side chains. The soluble fraction of PNDTDPP-OD polymer in chloroform has much lower molecular weight than that of PNDTDPP-DH polymer. PNDTDPP-DH polymer bearing relatively longer DH side chains exhibited much better charge-transport behavior than PNDTDPP-OD polymer with shorter OD side chains. The thermally annealed PNDTDPP-DH polymer thin films exhibited an outstanding charge carrier mobility of ∼1.32 cm2 V−1 s−1 (Ion/Ioff ∼ 108) measured under ambient conditions, which is almost six times higher than that of thermally annealed PNDTDPP-OD polymer thin films. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 5280–5290