摘要：

A novel synthetic route for preparation of amphiphilic heteroleptic ruthenium(II) complexes of the type [Ru(H 2dcbpy)Cl(cymene)]NO 3 ( 1) [Ru(H 2dcbpy)(dmbpy)(NCS) 2] ( 2), [Ru(H 2dcbpy)(dhbpy)(NCS) 2] ( 3) [Ru(H 2dcbpy)(dnbpy)(NCS) 2] ( 4) and [Ru(H 2dcbpy)(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.

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