The synthesis and characterization of 2-(2′-pyridyl)benzimidazole heteroleptic ruthenium complex: Efficient sensitizer for molecular photovoltaics
Makaleler > Tam Makale · 2009
Yazarlar: Cigdem ŞAHİN, Mahmut ULUSOY, Ceylan ZAFER, Cihan ÖZSOY, Canan VARLIKLI, Thomas DİTTRİCH, Bekir ÇETİNKAYA, Siddik İÇLİ
Dyes and Pigments, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2009, cilt 84, ss 88-94
DOI: 10.1016/j.dyepig.2009.06.016
Özet
The novel ligand 1-(2,4,6-trimethylbenzyl)-2-(2'-pyridyl)benzimidazole and its heteroleptic ruthenium (II) complex were synthesized. The complex was characterized using spectroscopic methods and cyclic voltammetry. Charge-separation was investigated within nanoporous titanium dioxide employing surface photovoltage spectroscopy. The performance of the ruthenium complex as a charge transfer photosensitizer in nanocrystalline, titanium dioxide-based, dye sensitized solar cells was studied under standard AM 1.5 sunlight using an electrolyte consisting of 0.6 M1-butyl-3-methyl-imidazolium iodide, 0.1 M lithium iodide, 0.05 M iodine and 0.5 M 4-tert-butyl pyridine in 3-methoxy propyonitrile. The novel complex had a photocurrent density of 9.47 mA cm(-2), 600 mV open circuit potential and 0.60 fill factor yielding an efficiency of 3.4%. The photovoltaic performance of the colorant was compared with that of cis-bis(isothiocyanato)(2,2'-bipyridyl-4,4'-dicarboxylato) (2,2'-bipyridyl-4,4'-di-nonyl) ruthenium(II): both compounds exhibited similar efficiency, while the fill factor value was higher for the novel dye. (C) 2009 Elsevier Ltd. All rights reserved.