Grätzel type-solar cells sensitized with some Colombian's dyes

In the present work we want to show some progress related to the effects of two colombian's natural dyes in the sensitized solar cells (Grätzel type). The dyes used are achiote and blackberry, which are used to develop a photochemical process that mimics photosynthesis. The use of sensitizers in conjunction with nanocrystalline oxide semiconductor films (TiO2) permits to increase the absorption of sunlight. Raman spectroscopy technique has been used to characterize the achiote. They show that the samples have a strong fluorescence in the range between 640 and 800 nm, and this fluorescence is very sensitive to the laser power. After the construction of the solar cells, the efficiencies determined are around 0.13%, in the best of our cases.