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Microstructure determines crystallinity-driven singlet fission efficiency in diF-TES-ADT.

Hoyeon Choi1,2, Stefan Skalsky1, David G Bossanyi3

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|July 3, 2025
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Summary
This summary is machine-generated.

Singlet fission (SF) efficiency in anthradithiophene films depends on microstructure. Highly crystalline regions show enhanced SF due to favorable charge-transfer states, impacting overall solar energy performance.

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Area of Science:

  • Photovoltaics and Renewable Energy
  • Materials Science
  • Organic Electronics

Background:

  • Singlet fission (SF) converts one photon into two high-energy triplet excitons, a process crucial for enhancing solar cell efficiency.
  • Understanding the link between film microstructure, temperature, and SF efficiency is vital for optimizing solar energy conversion.
  • Anthradithiophene (diF-TES-ADT) derivatives are promising materials for SF due to their high efficiency.

Purpose of the Study:

  • To investigate the correlation between local film morphology and primary singlet fission (PSF) efficiency in diF-TES-ADT thin films.
  • To elucidate the role of crystallinity and temperature on PSF efficiency at a microscale level.
  • To provide insights into optimizing SF materials by considering spatial inhomogeneities.

Main Methods:

  • Cryogenic fluorescence microscopy was employed to spatially resolve PSF efficiency.
  • Hyperspectral microscopy provided sub-micron resolution of absorption and emission properties.
  • Temperature- and time-resolved spectroscopy were used to analyze exciton dynamics.

Main Results:

  • PSF efficiency was found to be spatially inhomogeneous within the diF-TES-ADT film.
  • Higher PSF efficiency directly correlated with regions of increased local crystallinity.
  • Enhanced PSF in crystalline areas was attributed to favorable endothermic alignment of a charge-transfer (CT) state.

Conclusions:

  • Local film morphology, particularly crystallinity, significantly influences SF efficiency.
  • Spatial inhomogeneity in SF materials must be considered for accurate performance evaluation.
  • Relying solely on spatially averaged metrics can be misleading for SF material assessment in solar applications.