Dye Sensitized solar sell

Using Grape Juice

Grape Dye Sensitized Solar Cells

The Grape based natural

dye was extracted from

Red Grape using Grape grains.

Basic Construction

• 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.

Energy Level Diagram

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.

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