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Abstract
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.
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O'Regan B, aud Gractzel M, 1991, A low-cost, high-efficiency solar cell based on dye- sensitized colloidal TIO2 films, Nature 353, 737
Ali Ram. and Nayan N, 2010, Fabrication and analysis of dye- sensitized solar cell using natural dye extracted from dragon fruit, International Journal of Integrated Engineering, 2 55
Calogero G, et al. 2012, Anthocyanins and betalains as light-harves- ting pigments for dye-sensitized solar cells, Solar Energy 86, 1563
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