Stepwise Assembly of Amphiphilic Ruthenium Sensitizers and their Applications in Dye Sensitized Solar Cell

By Md. K. Nazeeruddin, S. M. Zakeeruddin, Jean-Jacques Lagref, P. Liska, Pascal Comte, C. Barolo, G. Viscardi, K. Schenk, M. Graetzel. 2004

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Abstract A novel synthetic route for preparation of amphiphilic heteroleptic ruthenium(II) complexes of the type [Ru(H 2 dcbpy)Cl(cymene)]NO 3 ( 1 ) [Ru(H 2 dcbpy)(dmbpy)(NCS) 2 ] ( 2 ), [Ru(H 2 dcbpy)(dhbpy)(NCS) 2 ] ( 3 ) [Ru(H 2 dcbpy)(dnbpy)(NCS) 2 ] ( 4 ) and [Ru(H 2 dcbpy)(dtdbpy)(NCS) 2 ] ( 5 ) have been developed starting from dichloro( p -cymene)ruthenium(II) dimer. The performance of these complexes as charge-transfer photosensitizers in nanocrystalline TiO 2 -based solar cells was studied. When anchored complexes 2 – 5 onto a 12+4 μm thick nanocrystalline TiO 2 films achieve very efficient sensitization over 85±5% incident photon-to-current efficiencies (IPCEs) in the visible region. Under standard AM 1.5 sunlight, using an electrolyte consisting of 0.6 M BMII; 0.05 M I 2 ; 0.1 M LiI; 0.5 M tert -butyl pyridine in 1:1 acetonitrile + valeronitrile the films yielded a short circuit photocurrent density of 16±0.5 mA/cm 2 and the open circuit voltage was 700±50 mV and a fill factor of 0.75±0.05, corresponding to an overall conversion efficiency of 8.6%. Solar cells based on amphiphilic sensitizers show remarkable stability under both thermal stress and light soaking matching the durability criteria applied to silicon solar cells for outdoor applications.

Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/65a1eaaa674cd27c3419bf6ec98f206e9374e00c

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