title: Vectorial photoinduced electron transfer in multicomponent film systems of poly(3-hexylthiophene), porphyrin-fullerene dyad, and perylenetetracarboxidiimide.
abstract: Multistage electron transfer in a film system consisting of a hole-transporting layer (HTL), donor-acceptor pair (D-A), and an electron-transporting layer (ETL) was studied by photovoltage and flash-photolysis techniques. Poly(3-hexylthiophene) (PHT) was used as the HTL, while a symmetric porphyrin-fullerene dyad (P-F) and perylenetetracarboxidiimide (PTCDI) layers were functioning as the D-A pair and ETL, respectively. The photoexcitation of this three-component film system causes charge separations in the monomolecular P-F film, followed by electron transfer from the PHT polymer film and the fullerene anions to the porphyrin cations and the PTCDI layer, respectively. The final transient state is a charged PHT(+)|P-F|PTCDI(-) system, with significantly increased amplitude and lifetime of the photoelectrical signals compared to previously studied P-F|PTCDI and PHT|P-F systems, due to the its increased charge-separation distance. The study promotes the knowledge on the charge transfer mechanism in multilayered film systems.
authors.affiliation: Department of Chemistry and Bioengineering, Tampere University of Technology, P.O. Box 541, FI-33101, Tampere, Finland. paola.vivo@tut.fi
authors.forename: Paola
authors.initials: P
authors.lastname: Vivo
authors.forename: Kimmo
authors.initials: K
authors.lastname: Kaunisto
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Alekseev
authors.forename: Oili
authors.initials: O
authors.lastname: Pekkola
authors.forename: Antti
authors.initials: A
authors.lastname: Tolkki
authors.forename: Vladimir
authors.initials: V
authors.lastname: Chukharev
authors.forename: Helge
authors.initials: H
authors.lastname: Lemmetyinen