Dithienothiophene-diketopyrrolopyrrole-containing copolymers with alkyl side-chain and their application to polymer solar cells

Suna Choi, Gi Eun Park, Jicheol Shin, Hyun Ah Um, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We synthesized a series of dithieno[3,2-b:2′,3′-d]thiophene and diketopyrrolopyrrole (DPP) based alternating copolymers, PDTTDPPs, with one of three branched alkyl side-chains (2-ethylhexyl, 2-butyloctyl, or 2-decyltetradecyl chains) tethered to the DPP moiety. These branched alkyl side-chains of various sizes were anchored to the DPP moiety owing to the relatively facile synthesis of DPP-based building blocks. We investigated the characteristics of the new PDTTDPP-based conjugated polymers bearing different alkyl chain substituents and the effect of the side chain on the device performance. A PDTTDPP-DT-based thin film transistor (TFT) exhibited the highest mobility of 6.88 × 10-2 cm2 V-1 s-1, whereas the mobilities of TFTs made with PDTTDPP-EH and PDTTDPP-BO polymers were 6.13 × 10-3 and 7.65 × 10-3 cm2 V-1 s-1, respectively. A polymer solar cell based on PDTTDPP-DT:[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) (1:1.5 w/w) showed the highest power conversion efficiency of 3.44%.

Original languageEnglish
Pages (from-to)167-173
Number of pages7
JournalSynthetic Metals
Publication statusPublished - 2016 Feb 1


  • Alkyl chain engineering
  • Conjugated polymer
  • Organic semiconductor
  • Polymer solar cell

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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