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Ultrafast Energy And Electron Transfer In Conjugated Oligomer-Fullerene Molecules

Published online by Cambridge University Press:  21 March 2011

P.A. van Hal ,
R.A.J. Janssen ,
G. Lanzani ,
G. Cerullo ,
M. Zavelani-Rossi  and
S. De Silvestri
P.A. van Hal
Affiliation:
Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
R.A.J. Janssen
Affiliation:
Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
G. Lanzani
Affiliation:
Istituto Nazionale per la Fisica della Materia, C.E.Q.S.E.-C.N.R., Dipartimento di Fisica, Politecnico di Milano, Piazza L. Da Vinci 32, 20133 Milano, Italy
G. Cerullo
Affiliation:
Istituto Nazionale per la Fisica della Materia, C.E.Q.S.E.-C.N.R., Dipartimento di Fisica, Politecnico di Milano, Piazza L. Da Vinci 32, 20133 Milano, Italy
M. Zavelani-Rossi
Affiliation:
Istituto Nazionale per la Fisica della Materia, C.E.Q.S.E.-C.N.R., Dipartimento di Fisica, Politecnico di Milano, Piazza L. Da Vinci 32, 20133 Milano, Italy
S. De Silvestri
Affiliation:
Istituto Nazionale per la Fisica della Materia, C.E.Q.S.E.-C.N.R., Dipartimento di Fisica, Politecnico di Milano, Piazza L. Da Vinci 32, 20133 Milano, Italy
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Abstract

The intramolecular photoinduced energy and electron transfer within a fullereneoligothiophene-fullerene triad with nine thiophene units (C60-9T-C60) and an oligo(p-phenylene vinylene)-fullerene dyad with four phenyl groups (OPV4-C60) is investigated with femtosecond pump-probe spectroscopy with sub-10 fs and 200 fs time resolution in solvents of different polarity. Photoexcitation of the π-conjugated oligomer moiety in the triad and dyad results in an ultrafast singlet-energy transfer reaction to create the fullerene singlet-excited state with a time constant of 150-190 fs, irrespective of the polarity of the medium. In a polar solvent, intramolecular electron transfer occurs from the oligomer moiety to the C60 moiety with a time constant of 10-13 ps as a secondary reaction, subsequent to the ultrafast singlet-energy transfer. The charge-separated state has a lifetime of 50-80 ps and recombines to the ground state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 665: Symposium C – Electronic, Optical and Optoelectronic Polymers and Oligomers , 2001 , C7.3
Copyright
Copyright © Materials Research Society 2001

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