Singlet-triplet fission is a multiexciton generation process in which two triplets or charge carriers are generated for each absorbed photon − a process which may substantially enhance the efficiency of solar cells. Using temperature-dependent broadband optical pump-probe spectroscopy we provide experimental evidence that the fission process in pentacene is governed by the internal dynamics of a double dark state with biexciton char- acter. The biexciton formation occurs on sub-ps timescales and is accompanied by delayed blueshifted superradiance at low temperatures due to defects and quantum confinement.
CITATION STYLE
Thorsmolle, V. K., Kuhlman, T. S., Demsar, J., Averitt, R. D., Campbell, I., Crone, B. K., … Taylor, A. J. (2009). Dynamics of superradiant biexcitons in pentacene: Singlet fission mediated by double dark state. Physics. Internes Papier.
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