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INTRODUCTION TO DYE-SENSITIZED SOLAR CELLS (DSSC) 669
4
3
N3 dye
Black dye
1.0
0.8
Absorbance
2
0.6
0.4
1 − T
1
0.2
0 0
300 400 500 600 700 800 900 1000
Wavelength
[nm]
Figure 15.4 Absorption spectra of N3 dye and black dye represented by absorbance and light-harvesting
efficiency, 1–T (T : transmittance): ( ) N3 dye, ( ) black dye
10.0 A
10.23 A
Figure 15.5 Anchoring structure of N3 dye adsorbed on the (101) surface of TiO 2 :thetopisN3
dye and the bottom is TiO 2 . Reprinted with permission from © (2002) American Chemical Society
15.1.2.5 Counter electrode
Tri-iodide ions, I 3 − , formed by the reduction of dye cations with I − ion, are re-reduced
to I − ions at the counter electrode. To reduce the tri-iodide ions, the counter electrode
must have high electrocatalytic activity. Pt coated on TCO substrate (5–10 µgcm −2 or
approximately 200-nm thickness) or carbon are usually used as the counter electrode.