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Dive into the research topics where Gabor Benkö is active.

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Featured researches published by Gabor Benkö.


Journal of Physical Chemistry B | 2004

Photoinduced Ultrafast Dynamics of Ru(dcbpy)2(NCS)2-Sensitized Nanocrystalline TiO2 Films: The Influence of Sample Preparation and Experimental Conditions

Jani Kallioinen; Gabor Benkö; Pasi Myllyperkiö; Leonid Khriachtchev; Björn Skårman; Reine Wallenberg; Markus Tuomikoski; Jouko Korppi-Tommola; Villy Sundström; Arkady Yartsev

In most of the previous ultrafast electron injection studies of Ru(dcbpy)2(NCS)2-sensitized nanocrystalline TiO2 films, experimental conditions and sample preparation have been different from study to study and no studies of how the differences affect the observed dynamics have been reported. In the present paper, we have investigated the influence of such modifications. Pump photon density, environment of the sensitized film (solvent and air), and parameters of the film preparation (crystallinity and quality of the film) were varied in a systematic way and the obtained dynamics were compared to that of a well-defined reference sample: Ru(dcbpy)2(NCS)2-TiO2 in acetonitrile. In some cases, the induced changes in the dynamics were uncorrelated to the electron injection process. High pump photon density (not in the linear response region) and exposure of the sensitized film to air altered the picosecond-time-scale kinetics considerably, and the changes were attributed mostly to degradation of the dye. In other cases, changes in the measured kinetics were related to the electron injection processes: reducing the firing temperature of the nanocrystalline film or making the film via electron beam evaporation (EBE) resulted in a decrease of the overall crystallinity of the film, and the electron injection slowed. In the sensitized EBE films, in addition to an increased contribution of triplet excited-state electron injection, a new electron transfer (ET) process with a time constant of 200 fs was observed.


Journal of the American Chemical Society | 2002

Photoinduced ultrafast dye-to-semiconductor electron injection from nonthermalized and thermalized donor states.

Gabor Benkö; Jani Kallioinen; Jouko Korppi-Tommola; and Arkady Yartsev; Villy Sundström


Journal of the American Chemical Society | 2002

Modified phthalocyanines for efficient near-IR sensitization of nanostructured TiO(2) electrode.

Jianjun He; Gabor Benkö; Ferenc Korodi; Tomáš Polívka; Reiner Lomoth; Björn Åkermark; Licheng Sun; and Anders Hagfeldt; Villy Sundström


Journal of Physical Chemistry B | 2002

Electron transfer from the singlet and triplet excited states of Ru(dcbpy)(2)(NCS)(2) into nanocrystalline TiO2 thin films

Jani Kallioinen; Gabor Benkö; Villy Sundström; Jouko Korppi-Tommola; Arkady Yartsev


Journal of Physical Chemistry B | 2004

Interligand electron transfer determines triplet excited state electron injection in RuN3-sensitized TiO2 films

Gabor Benkö; Jani Kallioinen; Pasi Myllyperkiö; Florentina Trif; Jouko Korppi-Tommola; Arkady Yartsev; Villy Sundström


Journal of the American Chemical Society | 2003

Photoinduced Electron Injection from Ru(dcbPY)2(NCS)2 to SnO2 and TiO2 Nanocrystalline Films.

Gabor Benkö; Pasi Myllyperkiö; Jie Pan; Arkady Yartsev; Villy Sundström


Journal of Physical Chemistry B | 2003

Particle Size and Crystallinity Dependent Electron Injection in Fluorescein 27-Sensitized TiO2 Films

Gabor Benkö; Björn Skårman; Reine Wallenberg; Anders Hagfeldt; Villy Sundström; Arkady Yartsev


Journal of the American Chemical Society | 2002

Photoinduced electron transfer between a carotenoid and TiO2 nanoparticle

Jie Pan; Gabor Benkö; Yunhua Xu; Torbjörn Pascher; Licheng Sun; Villy Sundström; Tomáš Polívka


Journal of Physical Chemistry B | 2001

Electron Injection and Recombination in Fluorescein 27-Sensitized TiO2 Thin Films

Gabor Benkö; Marcus Hilgendorff; and Arkady Yartsev; Villy Sundström


Journal of Physical Chemistry B | 2004

Stepwise charge separation from a ruthenium-tyrosine complex to a nanocrystalline TiO2 film

Jingxi Pan; Yunhua Xu; Gabor Benkö; Yashar Feyziyev; Stenbjörn Styring; Licheng Sun; Björn Åkermark; Tomáš Polívka; Villy Sundström

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Arkady Yartsev

Chalmers University of Technology

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Jani Kallioinen

University of Jyväskylä

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Licheng Sun

Royal Institute of Technology

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Yunhua Xu

Royal Institute of Technology

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