Publication

Organisation and Reactivity of Nanoparticles at Molecular Interfaces. Part II. Dye Sensitisation of TiO2 Nanoparticles Assembled at the Water|1,2-Dichloroethane Interface

Hubert Girault, Jacques-Edouard Moser
2003
Journal Articles

Abstract

Contactless dye-sensitised nano-photoelectrodes assembled at polarisable liquid|liquid interfaces exhibit photocurrent responses originating from the heterogeneous photooxidation of ferrocene by the colloids. The photocurrent spectra of the nanoparticle assembly sensitised by alizarin indicate that the photoreaction is initiated by an ultrafast electron injection from the dye into the conduction band of the TiO2 particles, followed by heterogeneous electron transfer from ferrocene to the oxidised dye, as shown.

Official source

https://infoscience.epfl.ch/entities/publication/c1ecb832-4ff1-469c-85e3-4ebba514ed05

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Hubert Girault, Jacques-Edouard Moser
2003
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c1ecb832-4ff1-469c-85e3-4ebba514ed05

About this result

Related concepts (21)

Quantum dot

Quantum dots (QDs) – also called semiconductor nanocrystals, are semiconductor particles a few nanometres in size, having optical and electronic properties that differ from those of larger particles as a result of quantum mechanics. They are a central topic in nanotechnology and materials science. When the quantum dots are illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conductance band.

Dye-sensitized solar cell

A dye-sensitized solar cell (DSSC, DSC, DYSC or Grätzel cell) is a low-cost solar cell belonging to the group of thin film solar cells. It is based on a semiconductor formed between a photo-sensitized anode and an electrolyte, a photoelectrochemical system. The modern version of a dye solar cell, also known as the Grätzel cell, was originally co-invented in 1988 by Brian O'Regan and Michael Grätzel at UC Berkeley and this work was later developed by the aforementioned scientists at the École Polytechnique Fédérale de Lausanne (EPFL) until the publication of the first high efficiency DSSC in 1991.

Valence and conduction bands

In solid-state physics, the valence band and conduction band are the bands closest to the Fermi level, and thus determine the electrical conductivity of the solid. In nonmetals, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature, while the conduction band is the lowest range of vacant electronic states. On a graph of the electronic band structure of a semiconducting material, the valence band is located below the Fermi level, while the conduction band is located above it.

Related publications (9)

Organisation and Reactivity of Nanoparticles at Molecular Interfaces. Part II. Dye Sensitisation of TiO2 Nanoparticles Assembled at the Water|1,2-Dichloroethane Interface

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