Semicrystalline Unfused Polymer Donors with Backbone Halogenation toward Cost-Effective Organic Solar Cells

Yuxin Kong, Shijie Ju, Hongmei Qin, Min Hun Jee, Simeng Xia, Jiaqi Ren, Chao Gao, Jianyu Yuan, Wenyan Su, Han Young Woo, Yuxiang Li

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Developing novel unfused building blocks with simple synthesis and low cost is essential to advance and enrich cost-effective polymer donors; however, it remains a challenge due to the lack of efficient molecular strategies. Herein, a class of low-cost and fully unfused polymer donors with precisely regulated backbone planarity via halogenation was designed and synthesized, namely PDTBTBz-2H, PDTBTBz-2F, and PDTBTBz-2Cl. These polymer donors possess a four-step synthesis route with over 80% yield from cheap raw chemicals comparable to existing low-cost polymer donors, such as PTQ10. Benefitting from the planar backbone via incorporating the F···S non-covalent interactions, PDTBTBz-2F exhibits more robust J-type aggregation in solution and a long-ranged molecular stacking in film relative to PDTBTBz-2H and PDTBTBz-2Cl. Moreover, the systematical study of PDTBTBz-based organic solar cells (OSCs) reveals the close relationship between optimized molecular self-assembly and charge separation/transport regarding backbone halogenation when paired with the non-fullerene acceptor (Y6-BO-4F). As a result, the photovoltaic devices based on semicrystalline PDTBTBz-2F achieved a promising power conversion efficiency (PCE) of 12.37%. Our work highlighted the influence of backbone halogenation on the molecular self-assembly properties and a potential unfused backbone motif for further developing cost-effective OSCs.

Original languageEnglish
Pages (from-to)752-759
Number of pages8
JournalChinese Journal of Chemistry
Issue number7
Publication statusPublished - 2024 Apr 1

Bibliographical note

Publisher Copyright:
© 2023 SIOC, CAS, Shanghai, & WILEY-VCH GmbH.


  • Backbone halogenation
  • Low-cost
  • Molecular self-assembly
  • Organic solar cells
  • Polymer donors

ASJC Scopus subject areas

  • General Chemistry


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