Improved Molecular Ordering in a Ternary Blend Enables All-Polymer Solar Cells over 18% Efficiency

Yunhao Cai, Cong Xie, Qian Li, Chunhui Liu, Jiaxin Gao, Min Hun Jee, Jiawei Qiao, Yun Li, Jiali Song, Xiaotao Hao, Han Young Woo, Zheng Tang, Yinhua Zhou, Chunfeng Zhang, Hui Huang, Yanming Sun

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Although all-polymer solar cells (all-PSCs) show great commercialization prospects, their power conversion efficiencies (PCEs) still fall behind their small molecule acceptor-based counterparts. In all-polymer blends, the optimized morphology and high molecular ordering are difficult to achieve since there is troublesome competition between the crystallinity of the polymer donor and acceptor during the film-formation process. Therefore, it is challenging to improve the performance of all-PSCs. Herein, a ternary strategy is adopted to modulate the morphology and the molecular crystallinity of an all-polymer blend, in which PM6:PY-82 is selected as the host blend and PY-DT is employed as a guest component. Benefiting from the favorable miscibility of the two acceptors and the higher regularity of PY-DT, the ternary matrix features a well-defined fibrillar morphology and improved molecular ordering. Consequently, the champion PM6:PY-82:PY-DT device produces a record-high PCE of 18.03%, with simultaneously improved open-circuit voltage, short-circuit current and fill factor in comparison with the binary devices. High-performance large-area (1 cm2) and thick-film (300 nm) all-PSCs are also successfully fabricated with PCEs of 16.35% and 15.70%, respectively.Moreover, 16.5 cm2 organic solar module affords an encouraging PCE of 13.84% when using the non-halogenated solvent, showing the great potential of “Lab-to-Fab” transition of all-PSCs.

Original languageEnglish
Article number2208165
JournalAdvanced Materials
Volume35
Issue number8
DOIs
Publication statusPublished - 2023 Feb 23

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • all-polymer solar cells
  • crystallinity
  • efficiency
  • molecular ordering
  • ternary strategy

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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