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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 10
BKCSDE 30(10)
October 20, 2009 

Synthesis and Photovoltaic Properties of Novel Ruthenium(II) Sensitizers for Dye-sensitized Solar Cell Applications
Tae In Ryu, Myungkwan Song, Myung Jin Lee, Sung Ho Jin*, Sunwoo Kang, Jin Yong Lee, Jae Wook Lee*, Chan Woo Lee, Yeong Soon Gal
Ruthenium sensitizer, Oligothiophene, Dye-sensitized solar cell
Three heteroleptic ruthenium sensitizers, Ru(L)(L1)(NCS)2 [L = 4,4'-dicarboxylic acid-2,2'-bipyridine, Ru-T1: L1 = (E)-2-(4'-methyl-2,2'-bipyridin-4-yl)-3-(thiophen-2-yl)acrylonitrile, Ru-T2: L2 = (E)-3-(5'-hexyl-2,2'-bithiophen-5- yl)-2-(4'-methyl-2,2'-bipyridin-4-yl)acrylonitrile, and Ru-T3: L3 = (E)-3-(5"-hexyl-2,2':5',2"-terthiophen-5-yl)-2- (4'-methyl-2,2'-bipyridin-4-yl)acrylonitrile)], were synthesized and used as photosensitizers in nanocrystalline dyesensitized solar cells (DSSCs). The introduction of the 3-(5-hexyloligothiophen-5-yl)acrylonitrile group increased the conjugation length of the bipyridine donor ligand and thus improved their molar absorption coefficient and light harvesting efficiency. DSSCs with the configuration of SnO2: F/TiO2/ruthenium dye/liquid electrolyte/Pt devices were fabricated using these Ru-T1∼T3 as a photosensitizers. Among the devices, the DSSCs composed of Ru-T2 exhibited highest power conversion efficiency (PCE) of 2.84% under AM 1.5 G illumination (100 mW/cm2).
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