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INTRODUCTION TO DYE-SENSITIZED SOLAR CELLS (DSSC) 665<br />

Light<br />

TiO 2 -coated electrode<br />

−<br />

+<br />

Counter electrode<br />

Magnified 1000 ×<br />

e −<br />

e −<br />

e −<br />

Light<br />

Glass<br />

Transparent conducting coating<br />

Dye and TiO 2<br />

Load<br />

e −<br />

e −<br />

e −<br />

Iodide Tri-iodide<br />

Glass<br />

Electrolyte (iodide/tri-iodide)<br />

Transparent conducting coating<br />

and catalyst<br />

Light<br />

Magnified 1000000 ×<br />

e −<br />

e −<br />

Electron injection<br />

Dye<br />

Electrolyte (iodide/tri-iodide)<br />

TiO 2 nanocrystals<br />

(diameter ≈ 20 nm)<br />

Iodide<br />

I −<br />

Cycle<br />

I 3<br />

−<br />

Tri-iodide<br />

Figure 15.1 Schematic structure of the nanocrystalline dye-sensitized solar cell (DSSC). Reprinted<br />

from Sol. Energy Mater. Sol. Cells, 55, Smestad G, 157–178, © 2002, with permission from Elsevier<br />

Science [15]

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