Journal
CHEMICAL PHYSICS LETTERS
Volume 345, Issue 1-2, Pages 33-38Publisher
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DOI: 10.1016/S0009-2614(01)00874-0
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The intramolecular photoinduced energy and electron transfer in a fullerene-oligothiophene-fullerene triad with nine thiophene units (C-60-9T-C-60) has been investigated with sub-10 fs pump-probe spectroscopy in solvents of different polarity. Photoexcitation of the oligothiophene moiety results in an ultrafast singlet-energy transfer reaction to create the fullerene singlet-excited state with a time constant of 95 fs, irrespective of the polarity of the medium. In a polar solvent, the ultrafast singlet-energy transfer is followed by intramolecular electron transfer from the oligothiophene to the fullerene with a time constant of 10 ps, resulting in a charge-separated state (CSS) with a lifetime of 80 ps. (C) 2001 Elsevier Science B.V. All rights reserved.
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