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Area of Science:

  • Organic electronics
  • Photochemistry
  • Materials science

Background:

  • Singlet fission (SF) is a key process for enhancing organic solar cell efficiency.
  • Efficient SF requires balanced intermolecular electronic coupling and favorable energy levels.
  • Crystal morphology significantly influences SF performance.

Purpose of the Study:

  • To investigate the role of interchromophoric rotation in modulating SF.
  • To evaluate the impact of rotation on electronic coupling and exciton energies.
  • To establish molecular design guidelines for efficient SF.

Main Methods:

  • Computational modeling of a terrylene dimer system.
  • Evaluation of effective electronic coupling for SF (V_SF).
  • Analysis of Frenkel exciton (FE/S1S0) and triplet-pair exciton (TT) energies.

Main Results:

  • Interchromophoric rotation selectively modulates monomer frontier molecular orbital interactions.
  • Optimal rotation in slip-stacked arrangements lowers TT state energy below FE state energy.
  • SF is favored over competing pathways like excimer formation, increasing triplet yield.

Conclusions:

  • Interchromophoric rotation is crucial for achieving efficient SF.
  • Molecular design should prioritize rotational control over solely slip-stacked arrangements.
  • This work provides insights for designing improved SF materials for solar cells.