期刊
NATURE CHEMISTRY
卷 5, 期 12, 页码 1019-1024出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.1801
关键词
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资金
- Herchel Smith Research Fellowship
- Marie Curie Scholarship
- European Community's Initial Training Network SUPERIOR [PITN-GA-2009-238177]
- Engineering and Physical Sciences Research Council
- Winton Programme for the Physics of Sustainability
- EPSRC [EP/G060738/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G060738/1] Funding Source: researchfish
Singlet exciton fission, the spin-conserving process that produces two triplet excited states from one photoexcited singlet state, is a means to circumvent the Shockley-Queisser limit in single-junction solar cells. Although the process through which singlet fission occurs is not well characterized, some local order is thought to be necessary for intermolecular coupling. Here, we report a triplet yield of 200% and triplet formation rates approaching the diffusion limit in solutions of bis(triisopropylsilylethynyl (TIPS)) pentacene. We observe a transient bound excimer intermediate, formed by the collision of one photoexcited and one ground-state TIPS-pentacene molecule. The intermediate breaks up when the two triplets separate to each TIPS-pentacene molecule. This efficient system is a model for future singlet-fission materials and for disordered device components that produce cascades of excited states from sunlight.
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