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Localization-dependent charge separation efficiency at an organic/inorganic hybrid interface

MPS-Authors
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Foglia,  Laura
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Bogner,  Lea
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Stähler,  Julia
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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(Preprint), 348KB

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Citation

Foglia, L., Bogner, L., Wolf, M., & Stähler, J. (2016). Localization-dependent charge separation efficiency at an organic/inorganic hybrid interface. Chemical Physics Letters, 646, 25-30. doi:10.1016/j.cplett.2015.12.050.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-4DDC-7
Abstract
By combining complementary optical techniques, photoluminescence and time-resolved excited state absorption, we achieve a comprehensive picture of the relaxation processes in the organic/inorganic hybrid system SP6/ZnO. We identify two long-lived excited states of the organic molecules of which only the lowest energy one, localized on the sexiphenyl backbone of the molecule, is found to efficiently charge separate to the ZnO conduction band or radiatively recombine. The other state, most likely localized on the spiro-linked biphenyl, relaxes only by intersystem crossing to a long-lived, probably triplet state, thus acting as a sink of the excitation and limiting the charge separation efficiency.