Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 33, Pages 8245-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201705355
Keywords
acene synthesis; pentacene; singlet fission; solar energy; ultrafast spectroscopy
Categories
Funding
- DFG Cluster of Excellence Engineering of Advanced Materials
- Emerging Fields initiative Singlet Fission (FAU)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Solar Technologies go Hybrid' (Bavarian State Ministry for Science, Research and Art)
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Singlet fission (SF) involves the spontaneous splitting of a photoexcited singlet state into a pair of triplets, and it holds great promise toward the realization of more efficient solar cells. Although the process of SF has been known since the 1960s, debate regarding the underlying mechanism continues to this day, especially for molecular materials. A number of different chromophores have been synthesized and studied in order to better understand the process of SF. These previous reports have established that pentacene and its derivatives are especially well-suited for the study of SF, since the energetic requirement E(S-1) >= 2E(T-1) is fulfilled rendering the process exothermic and unidirectional. Dimeric pentacene derivatives, in which individual pentacene chromophores are tethered by a spacer, have emerged as the system of choice toward exploring the mechanism of intramolecular singlet fission (iSF). The dimeric structure, and in particular the spacer, allows for controlling and tuning the distance, geometric relationship, and electronic coupling between the two pentacene moieties. This Minireview describes recent advances using pentacene dimers for the investigation of iSF.
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