Reference : TiO2 templated multilayer films used as high efficiency photoelectrode in liquid or soli...
Scientific congresses and symposiums : Unpublished conference
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/116587
TiO2 templated multilayer films used as high efficiency photoelectrode in liquid or solid DSSCs
English
Dewalque, Jennifer mailto [Université de Liège - ULg > Département de chimie (sciences) > LCIS - GreenMAT >]
Cloots, Rudi [Université de Liège - ULg > Département de chimie (sciences) > LCIS - GreenMAT >]
Mathis, François [Université de Liège - ULg > Département de physique > Physique nucléaire, atomique et spectroscopie >]
Chene, Grégoire [Université de Liège - ULg > Département de physique > Physique nucléaire, atomique et spectroscopie >]
Strivay, David [Université de Liège - ULg > Département de physique > Physique nucléaire, atomique et spectroscopie >]
Vertruyen, Bénédicte [Université de Liège - ULg > Département de chimie (sciences) > Chimie inorganique structurale >]
Henrist, Catherine [Université de Liège - ULg > Département de chimie (sciences) > LCIS - GreenMAT >]
10-Apr-2012
No
International
San Francisco MRS Spring Meeting 2012
du 9 au 13 avril 2012
Materials Research Society
San Francisco
USA
[en] TIO2 ; Templating ; Dye Sensitized Solar Cells
[en] Mesoporous anatase thin films are very promising materials to act as electrode in dye-sensitized solar cells. Randomly oriented nanocrystalline TiO2 particles are usually used to prepare photoelectrodes with a thickness of 10-15 µm. Templated-assisted dip-coating techniques are used to obtain thin films with ordered porosity. However, monolayer films prepared by dip-coating from a solution suffer from a low quantity of active material with a limited surface area, leading to poor photovoltaic performances. Therefore a multilayer deposition process is needed to increase the film thickness along with surface area. Multilayer dip-coating procedures have already been reported but are usually characterized by a lack of linearity in the evolution of parameters (roughness, surface area, PV performances) as the number of layer increases.
In this study, we investigate a dip-coating-based multilayer deposition technique delaying these limitations.
First, the influence of the template on the film organization and porosity is studied in terms of long-range order, percentage of porosity, pore size, surface area and pores connectivity. Different techniques such as transmission electron microscopy (TEM), atmospheric poroellipsometry (AEP) and UV-visible absorption spectroscopy (UV-vis.) have been used to describe the microstructural features of the films.
The film exhibiting the highest dye loading was selected and its thickness gradually increased up to 4 µm. Finally, the photovoltaic performances of the thick films (1 to 4 µm) have been evaluated in combination with the N719 dye and a liquid electrolyte and show excellent efficiency (6.1%) when compared to values reported in the literature. Such mesostructured films were compared in terms of photovoltaic performance with TiO2 nanoparticles films, generally used in DSSC.
Films were further evaluated by Rutherford Backscattering Spectrometry (RBS) as high performance photoelectrode in solid-state DSSCs, in combination with Z907 dye and Spiro-OMeTAD as solid electrolyte.
Patrimoine ULg
http://hdl.handle.net/2268/116587

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