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http://dx.doi.org/10.5012/bkcs.2007.28.8.1311

Synthesis and Application of New Ru(II) Complexes for Dye-Sensitized Nanocrystalline TiO2 Solar Cells  

Seok, Won-K. (Contribution from Department of Chemistry, Dongguk University)
Gupta, A.K. (Contribution from Department of Chemistry, Dongguk University)
Roh, Seung-Jae (Department of Chemistry, Hanyang University)
Lee, Won-Joo (Department of Chemistry, Hanyang University)
Han, Sung-Hwan (Department of Chemistry, Hanyang University)
Publication Information
Bulletin of the Korean Chemical Society / v.28, no.8, 2007 , pp. 1311-1316 More about this Journal
Abstract
To develop photo-sensitizers for dye-sensitized solar cells (DSCs) used in harvesting sunlight and transferring solar energy into electricity, we synthesize novel Ru(II) polypyridyl dyes and describe their characterization. We also investigate the photo-electrochemical properties of DSCs using these sensitizers. New dyes contain chromophore unit of dafo (4,5-diazafluoren-9-one) or phen-dione (1,10-phenanthroline-5,6-dione) instead of the nonchromophoric donor unit of thiocyanato ligand in cis-[RuII(dcbpy)2(NCS)2] (dcbpy = 4,4'-dicarboxy- 2,2'-bipyridine) coded as N3 dye. For example, the photovoltaic data of DSCs using [RuII(dcbpy)2(dafo)](CN)2 as a sensitizer show 6.85 mA/cm2, 0.70 V, 0.58 and 2.82% in short-circuit current (Jsc ), open-circuit voltage (Voc), fill factor (FF) and power conversion efficiency (Eff), which can be compared with those of 7.90 mA/ cm2, 0.70 V, 0.53 and 3.03% for N3 dye. With the same chelating ligand directly bonded to the Ru metal in the complex, the CN ligand increases the Jsc value by double, compared to the SCN ligand. The extra binding ability in these new dyes makes them more resistant against ligand loss and photo-induced isomerization within octahedral geometry.
Keywords
DSCs; New photosensitizers; Chromophore;
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