Enhanced Efficiency and Stability of Novel Pseudo-ternary Polymer Solar Cells Enabled by a Conjugated Donor Block Copolymer

Su Hong Park, Na Yeon Kwon, Sung Hoon Jung, Amit Kumar Harit, Han Young Woo, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The recent breakthrough in power conversion efficiencies (PCEs) of polymer solar cells (PSCs) that contain an active layer of a ternary system has achieved values of 18-19%; this has sparked interest for further research. However, this system has difficulties in optimizing the composition and controlling the interaction between the three active materials. In this study, we investigated the use of a donor1 (D1)-donor2 (D2) conjugated block copolymer (CBP), PM6-b-TT, to replace the physical blend of two donors. PM6-b-TT, which exhibits an extended absorption range, was synthesized by covalently bonding PM6, a medium-band gap polymer, with PBDT-TT, a wide-band gap polymer. The blend films containing PM6-b-TT and Y6-BO acceptor, demonstrated excellent crystallinity and a film morphology favorable for PSCs. The corresponding pseudo-ternary PSC exhibited significantly higher PCE and thermal stability than the PM6:PBDT-TT-based ternary device. This study unambiguously demonstrates that the novel D1-D2 CBP strategy, combined with the conventional binary and ternary system advantages, is a promising material production strategy that can boost the performance of future PSCs.

Original languageEnglish
Pages (from-to)20266-20277
Number of pages12
JournalACS Applied Materials and Interfaces
Volume15
Issue number16
DOIs
Publication statusPublished - 2023 Apr 26

Bibliographical note

Funding Information:
The authors acknowledge the financial support provided by the National Research Foundation (NRF) of Korea (2019R1A6A1A11044070, 2020R1I1A1A01066897, and 2022R1A2B5B02001454). The authors also express their gratitude to the Pohang Accelerator Laboratory (Pohang, Korea) for providing them with access to conduct grazing incidence X-ray diffraction measurements (GIWAXD) and to the Institute for Basic Science (IBS, Korea) for providing them with access to nuclear magnetic resonance data (NMR; Ascend 500, Bruker). The authors extend their gratitude to C.W. Koh and Prof. S. Park for their invaluable assistance in analyzing the spectroscopic data.

Publisher Copyright:
© 2023 American Chemical Society.

Keywords

  • conjugated block copolymer
  • morphology
  • power conversion efficiency
  • pseudo-ternary polymer solar cell
  • stability

ASJC Scopus subject areas

  • General Materials Science

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