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Understanding mechanisms in DSSCs is fundamental for their improvement; thisincludes the nanocrystalline semiconducting layer behaviour. Differentmesoporous TiO2 layers are fabricated and analyzed for possible use in DSSCsolar cells. The preparations included the addition of P123 triblock copolymeras structuring agent to the synthesized anatase sol. This preparation was alsomixed with Degussa P25 nanoparticles in one case and polystyrene latex inanother. Mesoporous mixed TiO2-SiO2 thin layers were also analyzed. The diversemorphology and features are studied by microscopic techniques and by means ofspectral quantum efficiency of a photoelectrochemical cell (PEC) that uses asphotoelectrode the unsensitized porous TiO\_2 layer. Contact angle measurementsare also performed. We have found that a very high specific area due to verysmall nanocrystals and small pores can hinder electrolyte penetration in thepores formed by TiO\_2 nanograins, affecting photoelectrodes efficiency.

On fundamental mechanisms in dye sensitized solar cells through the behaviour of different mesoporous titanium dioxide films