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Page updated at 12:43:23 PM on Monday, May 21st, 2012

EPHODS - Efficiency and PHOto-stability of Dye-based Sensitizers

Funded with €300,000.00 for 36 months (from February, 2010 to January, 2013) by Regione Toscana within POR FSE 2007-2013

Person in charge: Paolo Foggi

Nano-particles of titanium oxide for third generation photovoltaic cells.

The first aim of the project is the characterization of newly synthesized organic molecules showing broad absorption spectra in the visible region and capable of generating charge separation in the excited states. This type of molecular systems are able to inject an electron in semiconductors like TiO2 or SnO2 once functionalized with specific bridging moieties.

One of the major points is the lifetime of the excited state which should be long enough to allow the injection process. Intramolecular processes must be negligible on such time scale. A second point is the photostability. Many molecular systems are not so photostable to be utilized in devices supposed to last for long periods (1 - 2 years).

The other aspect of this project is the characterization of nanostructured TiO2 with and without the presence of the dye molecules. In this case one of the main issues is the back electron transfer which can reduce the efficiency of the cell.

Here are some interesting features of these materials:

  • they have two active faces able to capture the light under large solid angles;
  • they allow to produce transparent objects with various colours, useful for windows able to produce energy;
  • they can be used on flessible substrates and adapted to architectural and structural elements, even of big size.

Detecting of low cost dye molecules is an important element for TiO2 cell production. This project want to investigate the properties of chemical sensitizer and detect electron transport processes to obtain a higher exploitation of solar energy. Different competences are involved, especially in physics, chemistry and nanostructured titanium oxides production. This last part is made in collaboration with COLOROBBIA which is the industrial counterpart of the project.

 

Publications

Only publications with LENS-affiliated authors are listed and for now there is no one.