Polariton-assisted Singlet Fission in acene Aggregates*

The recent developments of nanostructures that can afford a strong confinement of electromagnetic fields have opened up avenues to explore different regimes of strong light-matter interaction. Under these, photonic and material degrees of freedom mix and give rise to hybrid entities usually known as polaritons.
Interestingly, in recent years there have been efforts to explore the potential applications of strong light-matter (SC) interaction on photochemistry and electron transfer, showing that fluctuations of the electrodynamic vacuum may indeed have relevance in chemical processes.
In this work, we develop a simplified model to shed light on the relevance of SC on the yield of Singlet Fission (SF ) in a family of acenes. SF is particularly relevant in the field of exciton harvesting since it allows to produce two low-energy excitons from a highly energetic one, which translates into a significant increase in the quantum yield of excitons produced per photon absorbed in the materials that feature this process. Our results show that theoretically, it is possible to enhance the SF quantum yield for some materials, by correctly tuning experimental parameters.