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Singlet fission in pancake-bonded systems.

S Ito1, T Nagami1, M Nakano2

  • 1Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.

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This study explores pancake-bonded systems for efficient singlet fission, a process vital for solar energy. Researchers found specific molecular arrangements that enhance this process, offering new design guidelines for better solar materials.

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Area of Science:

  • Theoretical Chemistry
  • Materials Science
  • Photovoltaics

Background:

  • Singlet fission (SF) is a crucial photophysical process for enhancing solar cell efficiency.
  • Designing molecules that efficiently undergo SF while maintaining charge mobility is challenging.
  • Pancake-bonded systems offer a unique structural motif for molecular interactions.

Purpose of the Study:

  • To theoretically investigate the potential of pancake-bonded systems for efficient singlet fission.
  • To explore phenalenyl radical dimer and tetramer models to understand SF mechanisms.
  • To establish design guidelines for optimizing SF in molecular crystals.

Main Methods:

  • Theoretical calculations were performed on phenalenyl radical dimer and tetramer models.
  • Diradical character tuning by adjusting intermolecular distance was investigated in the dimer model.
  • Electronic couplings for SF and charge mobility were analyzed in the tetramer model using quasi-degenerate second-order perturbation analysis.

Main Results:

  • Efficient SF can be achieved in dimer models by tuning diradical character via intermolecular distance.
  • In tetramer models, face-to-face configurations simultaneously maximize SF and charge mobility couplings.
  • This overcomes the typical trade-off observed in conventional π-conjugated molecules like pentacene.

Conclusions:

  • Pancake-bonded systems show significant potential for highly active singlet fission.
  • A simplified crystal structure design guideline for efficient SF in these systems was developed.
  • This research provides a pathway for designing next-generation organic photovoltaic materials.