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Controlling Singlet Fission by Molecular Contortion.

Felisa S Conrad-Burton1, Taifeng Liu1,2, Florian Geyer1

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Singlet fission (SF) can boost solar cell efficiency. Researchers used molecular strain to enhance SF rates by 100-fold, expanding material options for this promising energy technology.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Renewable Energy

Background:

  • Singlet fission (SF) is a photophysical process with potential to increase solar energy conversion efficiency by generating two triplet excitons from one photon.
  • A key limitation to SF material development is the scarcity of molecules exhibiting high SF yields and robust chemical stability.

Purpose of the Study:

  • To demonstrate a strategy for developing novel SF materials by tuning molecular energetics using controlled strain.
  • To investigate the effect of backbone strain on the SF properties of perylene diimide (PDI) derivatives.

Main Methods:

  • Utilizing perylene diimide as a model system to investigate strain-induced modifications.
  • Applying mechanical strain to the molecular backbone to systematically alter singlet and triplet energy levels.
  • Quantifying changes in SF energetics (endoergic, exoergic, iso-energetic) and SF rates.

Main Results:

  • Successfully tuned the SF energetics of perylene diimide by introducing backbone strain.
  • Achieved SF rates that are two orders of magnitude higher compared to unstrained systems.
  • Demonstrated the ability to shift SF from endoergic to exoergic or iso-energetic conditions via strain engineering.

Conclusions:

  • Strain engineering provides a powerful approach to optimize SF materials for enhanced performance.
  • This strategy significantly expands the molecular design space for efficient singlet fission materials.
  • The findings pave the way for developing next-generation solar energy conversion technologies.