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Researchers designed a new organic solar cell molecule, o-BTP-eC9, improving energy loss and achieving high power conversion efficiency. This advancement enhances organic solar cell performance and stability.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Organic solar cells require specific molecular properties for competitiveness, such as optimal charge transfer states and crystallinity.
  • Systematic molecular design rules for achieving these properties are underdeveloped.

Purpose of the Study:

  • To rationally design and synthesize a novel non-fullerene acceptor (o-BTP-eC9) for organic solar cells.
  • To investigate the photoelectric properties and device performance of the new molecule compared to a benchmark.

Main Methods:

  • Theoretical calculations guided the molecular design process.
  • Synthesis and characterization of the non-fullerene acceptor o-BTP-eC9.
  • Fabrication and testing of organic solar cell devices using the new acceptor.

Main Results:

  • The designed o-BTP-eC9 exhibits an uplifted charge transfer state, reducing energy loss by 41 meV.
  • Single-junction devices based on o-BTP-eC9 achieved a power conversion efficiency of 18.7%.
  • Ternary systems incorporating o-BTP-eC9 demonstrated a certified power conversion efficiency of 19.5% with enhanced operational stability.

Conclusions:

  • The rational design approach successfully yielded o-BTP-eC9 with improved photoelectric properties.
  • o-BTP-eC9 shows excellent miscibility, crystallinity, and energy level compatibility, enabling high-efficiency ternary organic solar cells.
  • The developed molecule offers a promising pathway for advancing organic solar cell technology.