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Impressum
(c) 2002 BMO

"Exciton-Exciton Annihilation as a Mechanism for Uphill Transfer in a Molecular Excitonic System"
C. N. Lincoln, M. Block, B. Baudisch, P. Malevich, H. von Berlepsch, E. Riedle and J. Hauer
EPJ Web Conf. 205, 06017 (2019).


Abstract:
Exciton dynamics in a HJ-aggregate of cyanine dye TTBC are investigated by transient absorption with a time resolution of <60 fs and power-dependent emission spectroscopies. Both measurements are consistent with an exciton delocalization length of ~28 monomers. A model assuming diffusive exciton motion reveals that the exciton mobility is at least bimodal and restricted to one spatial dimension. J-band diffusion rates of 2.69 and 2.79e-3 cm2s-1 are found, leading to maximal diffusion lengths of 449 and 14.5 nm. The findings indicate that exciton-exciton annihilation is the origin of effective uphill transfer. This mechanism, if present under solar radiation, maybe useful for organic photovoltaic systems.

BMO authors (in alphabetic order):
Bastian Baudisch
Matthias Block
Jürgen Hauer
Eberhard Riedle

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Letzte Änderung: 2016-09-14 13:34