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Packing Guidelines for Optimizing Singlet Fission Matrix Elements in Noncovalent Dimers.

Eric A Buchanan1, Josef Michl1,2

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This study provides guidelines for designing molecular dimers that enhance singlet fission efficiency. These guidelines simplify predicting optimal geometries using basic electronic properties of the monomers.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Organic Electronics

Background:

  • Singlet fission (SF) is a photophysical process that can generate two electron-hole pairs from one absorbed photon, a key process for improving solar cell efficiency.
  • Predicting and controlling SF efficiency in molecular systems is crucial for developing next-generation photovoltaic technologies.
  • Understanding the relationship between molecular geometry and SF efficiency is essential for rational design of SF materials.

Purpose of the Study:

  • To develop simplified guidelines for predicting optimal dimer geometries for maximizing singlet fission efficiency.
  • To establish a theoretical framework for guiding the design of molecular architectures that promote efficient singlet fission.

Main Methods:

  • A simplified frontier orbital model was employed to analyze noncovalent dimer systems.
  • The model focuses on the electronic interactions between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of monomer units.
  • Calculations of atomic orbital overlaps between the two monomers were used to assess electronic coupling.

Main Results:

  • Derived guidelines for dimer geometries that maximize the square of the electronic matrix element, a key factor in singlet fission.
  • Demonstrated that these guidelines depend only on monomer frontier orbital energies and inter-monomer atomic orbital overlaps.
  • The simplified model provides a computationally inexpensive route to predict promising dimer structures for singlet fission.

Conclusions:

  • The developed guidelines offer a practical approach to designing molecular dimers with enhanced singlet fission properties.
  • This work simplifies the prediction of optimal geometries, facilitating the discovery of new materials for efficient solar energy conversion.
  • The frontier orbital model provides a valuable tool for understanding and controlling photophysical processes in molecular aggregates.