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674 DYE-SENSITIZED SOLAR CELLS<br />

4.0<br />

3.5<br />

Current<br />

[mA]<br />

3.0<br />

2.5<br />

2.0<br />

1.5<br />

1.0<br />

0.5<br />

0.0<br />

V OC = 0.7210 V<br />

I max = 3.55 mA<br />

J SC = 20.53 mA cm −2<br />

Fill factor = 70.41%<br />

V max = 0.546 V<br />

I SC = 3.82 mA<br />

P max = 1.94 mW<br />

Efficiency = 10.4%<br />

−0.5<br />

−0.2<br />

0.0 0.2<br />

Voltage<br />

[V]<br />

0.4 0.6 0.8<br />

Figure 15.8 Photocurrent–voltage curve obtained for a nanocrystalline TiO 2 solar cell sensitized<br />

by black dye. The certified results were obtained at NREL (USA). Reprinted with permission from<br />

Hagfeldt A, Grätzel M, Acc. Chem. Res. 33, 269–277 (2000). © (2002) American Chemical Society<br />

Electron injection<br />

COOH<br />

Electron<br />

transfer<br />

− OOC<br />

− OOC<br />

N<br />

N<br />

N<br />

Ru<br />

N<br />

NCS<br />

NCS<br />

10 8 s −1<br />

I −<br />

10 2 − 10 0 s −1 10 10 − 10 12 s −1 Rereduction<br />

10 6 s −1<br />

COOH<br />

Recombination<br />

TiO 2<br />

10 1 − 10 0 s −1<br />

Dark current<br />

I 3<br />

−<br />

Figure 15.9<br />

Schematic diagram of electron-transfer processes in DSSC

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