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Grape Dye Sensitized Solar Cells
The Grape based natural
dye was extracted from
Red Grape using Grape grains.
• A conductivetransparent glass is used as electrode
• A paste of titanium dioxide is applied on it using ‘doctor blading’ method
Fabrication Process…
Electrode glass is put into dye bath and left overnight
Dye molecules attach to TiO2via chemical bonds. This is called the ‘Sensitisation’ process
Another conducting glassis glued on top using an easy melt plastic
Liquid electrolyte is filled through the drilled holes
The holes are sealed and the solar cell is complete.
Original state of Dye is subsequently restored by electron donation from the electrolyte(Redox iodide/Triodide).
Iodide is regenerated in turn by the reduction of triiodide at the counter electrode the circuit being completed via electron migration through the external load.
| Redox regeneration at the counter-electrode (oxidation).
|Dye regeneration reaction (reduction).
Working Principle
* The grape-dye dye shows the broad absorbance peak over 450-650 nm.
* The absorbance spectrum confirms the formation of a charge transfer (CT) complex between grape-dye molecules and TiO2 nanoparticles.
* The average transmittance of this dye is around 35%.
Experimental Findings
DSSCs show the most promising future due to their independence, environmentally friendly, low maintenance, and low cost
References
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6919162&tag=1. W. M. Campbell, K. W. Jolley, P. Wagner, K. Wagner, P. J. Walsh, K. C. Gordon, L. S. Mende, M. K. Nazeeruddin, Q. Wang, M. Grätzel, and D. L. Officer, Highly Efficient Porphyrin Sensitizers for Dye- Sensitized Solar Cells, J. Phys. Chem. C Letts. Vol. 111, pp. 11760-11762, 2007. B. O’Regan, M. Grätzel, A low-cost, high-efficiency solar cell based on dye
sensitized colloidal TiO2 films, Nature, Vol.353, pp. 737–740, 1991. Z.G. Chen, F.Y. Li, C.H. Huang, Organic D-ʌ-A Dyes for Dye-Sensitized Solar
Cell, Curr. Org. Chem. Vol. 11, No. 14, pp. 1241-1258, 2007.