Molecular-weight engineering of high-performing diketopyrrolopyrrole-based copolymer bearing high π-extended long donating units

Mai Ha Hoang, Duc Nghia Nguyen, Trinh Tung Ngo, Hyun Ah Um, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Two D-A alternating π-conjugated copolymers bearing diketopyrrolopyrrole (DPP) and sextetthiophene with different molecular weights were synthesized to investigate their physical properties and performance in thin-film transistors and photovoltaic cells. The solubility and molecular weight (MW) of these copolymers with a highly rigid backbone were improved by controlling the feeding ratio of the monomer in the polymerization mixture. These polymers exhibited high crystallinity with a predominant edge-on chain orientation on the substrate. The higher-MW P(DPP-6T)-2 copolymer displayed a higher hole mobility of 3.26 cm2 V-1 s-1 than the low-MW P(DPP-6T)-1 copolymer. Bulk heterojunction photovoltaic cells made of a blend of P(DPP-6T)-2 and (6,6)-phenyl C71-butyric acid methyl ester displayed good device performance with a power conversion efficiency of 4.68%.

Original languageEnglish
Pages (from-to)77-84
Number of pages8
Publication statusPublished - 2016 Jan 28

Bibliographical note

Funding Information:
This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number “ 104.02-2013.67 ”. This research was supported by National Research Foundation of Korea ( NRF2012R1A2A1A01008797 ) and by Key Research Institute Program ( NRF20100020209 ). MJ Cho particularly acknowledges the support from a Korea University grant (2014–2015). We are grateful to Pohang Accelerator Laboratory (Pohang, Korea) for allowing us to conduct the grazing incidence X-ray diffraction (GI-XRD) measurements.

Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.

Copyright 2018 Elsevier B.V., All rights reserved.


  • Diketopyrrolopyrrole
  • Photovoltaic cell
  • Thin film transistor

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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