Diketopyrrolopyrrole-based conjugated polymer entailing triethylene glycols as side chains with high thin-film charge mobility without post-treatments

S.F. Yang, Z.T. Liu, Z.X. Cai, M.J. Dyson, N. Stingelin, W. Chen, H.J. Ju, G.X. Zhang, D.Q. Zhang

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22 Citations (Scopus)
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Abstract

Side chain engineering of conjugated donor-acceptor polymers is a new way to manipulate their optoelectronic properties. Two new diketopyrrolopyrrole (DPP)-terthiophene-based conjugated polymers PDPP3T-1 and PDPP3T-2, with both hydrophilic triethylene glycol (TEG) and hydrophobic alkyl chains, are reported. It is demonstrated that the incorporation of TEG chains has a significant effect on the interchain packing and thin-film morphology with noticeable effect on charge transport. Polymer chains of PDPP3T-1 in which TEG chains are uniformly distributed can self-assemble spontaneously into a more ordered thin film. As a result, the thin film of PDPP3T-1 exhibits high saturated hole mobility up to 2.6 cm2 V-1 s-1 without any post-treatment. This is superior to those of PDPP3T with just alkyl chains and PDPP3T-2. Moreover, the respective field effect transistors made of PDPP3T-1 can be utilized for sensing ethanol vapor with high sensitivity (down to 100 ppb) and good selectivity.
Original languageEnglish
Article number1700048
Pages (from-to)1-8
JournalAdvanced Science
Volume4
Issue number8
DOIs
Publication statusPublished - 1 Aug 2017

Keywords

  • charge carrier mobility
  • conjugated donor–acceptor polymer
  • diketopyrrolopyrrole
  • side chains
  • triethylene glycol

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