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686 DYE-SENSITIZED SOLAR CELLS<br />

3<br />

N3<br />

Ru(dcbiq) 2 (NCS) 2<br />

Ru(dcphen) 2 (NCS) 2<br />

e<br />

[10 4 M −1 cm −1 ]<br />

2<br />

1<br />

0<br />

300<br />

400 500<br />

Wavelength<br />

[nm]<br />

600 700 800<br />

COOH<br />

COOH<br />

HOOC<br />

HOOC<br />

N<br />

N<br />

N<br />

Ru<br />

N<br />

NCS<br />

NCS<br />

HOOC<br />

N<br />

N<br />

N<br />

Ru<br />

N<br />

NCS<br />

NCS<br />

COOH<br />

HOOC<br />

COOH<br />

Ru(dcphen) 2 (NCS) 2 Ru(dcbiq) 2 (NCS) 2<br />

Figure 15.12 Molecular structures of new metal complex photosensitizers, Ru(dcphen) 2 (NCS) 2<br />

and Ru(dcbiq) 2 (NCS) 2 , and their absorption properties in ethanolic solution: ( ) N3 dye [6, 103],<br />

( ) Ru(dcbiq) 2 (NCS) 2 [103, 114], ( ) Ru(dcphen) 2 (NCS) 2 [111, 115, 117]. The y-axis is<br />

represented by molar absorption coefficient, ε<br />

of the semiconductor electrodes and accept electrons from I − ions, respectively, is very<br />

important in developing new efficient photosensitizers.<br />

Metal complexes having metal centers other than Ru have also been synthesized<br />

and their performance have been investigated. These include Fe complexes [123, 124],<br />

Os complexes [125–128], Re complexes [129], and Pt complexes [130]. A nanocrystalline<br />

TiO 2 solar cell sensitized by a square-planar platinum (II) complex containing<br />

4,4 ′ -dicarboxy-2,2 ′ -bipyridine and quinoxaline-2,3-dithiolate ligands showed an efficiency<br />

of 2.6% (J SC = 6.14 mA cm −2 and V OC = 0.60 V) under simulated AM1.5 solar irradiation<br />

[130]. However, highly efficient performance exceeding that of the Ru complex

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