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Highly efficient and stable binary and ternary organic solar cells using polymerized nonfused ring electron

Xiaodong Wang1, Nan Wei2, Ya-Nan Chen1

  • 1College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao 266071, China.

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Novel polymerized electron acceptors, P-2BTh and P-2BTh-F, were synthesized for organic solar cells (OSCs). P-2BTh-F achieved over 11% power conversion efficiency (PCE) and enhanced stability, showing promise for cost-effective solar energy.

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all-polymer organic solar cellsnonfused ring electron acceptorsorganic solar cellsternary blend strategy

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Non-fused ring electron acceptors are crucial for high-performance organic solar cells (OSCs).
  • Developing novel polymeric acceptors with improved efficiency and stability is an ongoing research area.

Purpose of the Study:

  • To design and synthesize two novel polymerized non-fused ring electron acceptors, P-2BTh and P-2BTh-F.
  • To evaluate their performance in organic solar cells (OSCs) and assess their stability.
  • To explore the potential of P-2BTh-F as a functional additive in ternary systems.

Main Methods:

  • Stille polymerization was used to synthesize the target polymers.
  • The synthesized polymers were characterized for their structural and optical properties.
  • Organic solar cells were fabricated using PBDB-T as the donor material and tested for power conversion efficiency (PCE) and stability.

Main Results:

  • P-2BTh-F exhibited a more planar backbone and red-shifted absorption compared to P-2BTh.
  • P-2BTh-F based OSCs achieved a PCE over 11%, significantly higher than P-2BTh based devices (8.7%).
  • All-polymer solar cells using PBDB-T:P-2BTh-F showed superior storage stability and maintained high PCE (19.45%) as an additive.

Conclusions:

  • The novel polymerized acceptors, particularly P-2BTh-F, demonstrate excellent potential for high-efficiency and stable organic solar cells.
  • The use of P-2BTh-F as a functional additive offers a cost-effective strategy for enhancing both binary and ternary OSCs.
  • This work paves the way for developing durable and efficient next-generation solar cell technologies.