Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 141, Issue 33, Pages 13143-13147Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b05357
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Funding
- U.S. Department of Energy [DE-SC0014563]
- Feodor Lynen Fellowship of the Alexander von Humboldt Society
- SIR Grant SUNDYN of the Italian Ministry of Education Universities and Research (MIUR) [RBSI14G7TL, CUP B82I1500090001]
- Columbia Nano Initiative Postdoctoral Fellowship
- National Natural Science Foundation of China [21761142011, 21772123, 51502173]
- Shanghai Government [18JC1412900, 18DZ2254200]
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Singlet fission, the generation of two triplet excited states from the absorption of a single photon, may potentially increase solar energy conversion efficiency. A major roadblock in realizing this potential is the limited number of molecules available with high singlet fission yields and sufficient chemical stability. Here, we demonstrate a strategy for developing singlet fission materials in which we start with a stable molecular platform and use strain to tune the singlet and triplet energies. Using perylene diimide as a model system, we tune the singlet fission energetics from endoergic to exoergic or iso-energetic by straining the molecular backbone. The result is an increase in the singlet fission rate by 2 orders of magnitude. This demonstration opens a door to greatly expanding the molecular toolbox for singlet fission.
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