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Ultrafast Electron Transfer and Decay Dynamics in a Small Band Gap Bulk Heterojunction Material
Author(s) -
Hwang I.W.,
Soci C.,
Moses D.,
Zhu Z.,
Waller D.,
Gaudiana R.,
Brabec C. J.,
Heeger A. J.
Publication year - 2007
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200602437
Subject(s) - materials science , ultrashort pulse , heterojunction , band gap , electron transfer , excitation , electron , chemical physics , charge carrier , fullerene , optoelectronics , photochemistry , optics , physics , chemistry , laser , quantum mechanics
Photoinduced electron transfer in a small band gap bulk heterojunction material (see figure) is studied by ultrafast spectroscopic methods. In this composite, the photo excitation initiates ultrafast electron transfer from the polymer to the fullerene, as in most bulk heterojunction materials. From analysis of the carrier recombination dynamics, we infer the existence of an intermediate charge transferred state from which long‐lived mobile positive and negative carriers are generated.