Journal ArticleDOI
Femtosecond Dynamics of Interfacial and Intermolecular Electron Transfer at Eosin-Sensitized Metal Oxide Nanoparticles
TLDR
In this article, photoinduced electron injection from eosin Y into the conduction band of titanium dioxide was further scrutinized, as previous studies on the charge injection from xanthene dyes have led to diverging conclusions.Abstract:
Photoinduced electron injection from eosin Y into the conduction band of titanium dioxide was further scrutinized, as previous studies on the charge injection from xanthene dyes have led to diverging conclusions. Eosin-sensitized TiO2 constitutes in many aspects a model system for studying the dynamics of charge injection: Adsorption of the sensitizer onto the oxide surface through electrostatic interaction and hydrogen bonding make this system exemplary of the weak electronic coupling case. The formation of dimeric eosin on the surface of metal oxide nanoparticles in an aqueous suspension was inferred from the study of the deactivation of the dye's singlet excited state on insulating particles, such as ZrO2 and Al2O3, and of the formation of the resulting radical ion pair, using femtosecond stimulated emission and transient absorption. It was found that dimers undergo ultrafast dismutation with a time constant of 500 fs. The same process occurs also on TiO2 particles and results in a competition between...read more
Citations
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Recent advances in the liquid-phase syntheses of inorganic nanoparticles.
TL;DR: The development of novel materials is a fundamental focal point of chemical research; and this interest is mandated by advancements in all areas of industry and technology.
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A surface science perspective on TiO2 photocatalysis
TL;DR: The field of surface science provides a unique approach to understand bulk, surface and interfacial phenomena occurring during TiO2 photocatalysis as mentioned in this paper, including photon absorption, charge transport and trapping, electron transfer dynamics, adsorbed state, mechanisms, poisons and promoters, and phase and form.
Journal ArticleDOI
Electron Transfer Dynamics in Dye-Sensitized Solar Cells
TL;DR: In this article, the materials design parameters that control the processes of charge separation, and thereby device efficiency, in dye-sensitized photoelectrochemical solar cells are discussed.
Journal ArticleDOI
High Molar Extinction Coefficient Heteroleptic Ruthenium Complexes for Thin Film Dye-Sensitized Solar Cells
Dai-Bin Kuang,Seigo Ito,Bernard Wenger,Cedric Klein,Jacques-E. Moser,Robin Humphry-Baker,Shaik M. Zakeeruddin,Michael Grätzel +7 more
TL;DR: The introduction of the alkoxystyryl group extends the conjugation of the bipyridine donor ligand increasing markedly their molar extinction coefficient and solar light harvesting capacity and the high extinction coefficients of these sensitizers enable realization of a new generation of a thin film dye sensitized solar cell (DSC) yielding high conversion efficiency at full sunlight even with viscous electrolytes based on ionic liquids or nonvolatile solvents.
Journal ArticleDOI
Theoretical Insights into Photoinduced Charge Transfer and Catalysis at Oxide Interfaces
TL;DR: In this article, the authors focus on processes that are essential in terms of photovoltaic and photocatlytic cells, and focus on the processes that can be improved.
References
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Photochemistry on nonreactive and reactive (semiconductor) surfaces
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Electron Transfer Reactions in Chemistry: Theory and Experiment (Nobel Lecture)
TL;DR: Since the late 1940s, the field of electron transfer processes has grown enormously, both in chemistry and biology as discussed by the authors, and the development of the field, experimentally and theoretically, as well as its relation to the study of other kinds of chemical reactions, presents an intriguing history, one in which many threads have been brought together.
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Temperature dependent activation energy for electron transfer between biological molecules
TL;DR: In this paper, the authors considered electron transfer between biological molecules in terms of a nonadiabatic multiphonon nonradiative decay process in a dense medium and derived an explicit, compact and useful expression for the electron transfer probability.
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Chain-length dependence of electronic and electrochemical properties of conjugated systems: polyacetylene, polyphenylene, polythiophene, and polypyrrole
TL;DR: In this paper, the valence effective Hamiltonian (VEH) technique is used to compute ionization potentials, optical transition energies, and electron affinities of oligomers and polymers in four conjugated systems: polyacetylene, poly@-phenylene), polythiophene, and polypyrrole.
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Subpicosecond interfacial charge separation in dye-sensitized nanocrystalline titanium dioxide films
TL;DR: In this article, the rate of electron injection following optical excitation of the ruthenium dye RuII(2,2,bipyridyl-4,4‘-dicarboxylate)2(NCS)2 was investigated.