Ru-based donor-acceptor photosensitizer that retards charge recombination in a p-type dye-sensitized solar cell
2012 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 41, no 42, 13105-13111 p.Article in journal (Refereed) Published
We report on the synthesis and characterization of a donor-acceptor ruthenium polypyridyl complex as a photosensitizer for p-type dye-sensitized solar cells (DSSCs). The electrochemical, photophysical, and photovoltaic performance of two ruthenium-based photosensitizers were tested in NiO-based DSSCs; bis-(2,2′-bipyridine-4,4′-dicarboxylic acid) 2N-(1,10-phenanthroline)-4-nitronaphthalene-1,8-dicarboximide ruthenium(ii), ([Ru(dcb) 2(NMI-phen)](PF 6) 2) and tris-(2,2′-bipyridine-4,4′-dicarboxylic acid) 3 ruthenium(ii), [(Ru(dcb) 3)Cl 2]. The presence of an electron-accepting group, 4-nitronaphthalene-1,8-dicarboximide (NMI), attached to the phenanthroline of [Ru(dcb) 2(NMI-phen)] 2+ resulted in long-lived charge separation between reduced [Ru(dcb) 2(NMI-phen)] 2+ and NiO valence band holes; 10-50 μs. In the reduced state for [Ru(dcb) 2(NMI-phen)] 2+, the electron localized on the distal NMI group. In tests with I 3 -/I - and Co(4,4′-di-tert-butyl-bipyridine) 3 2+/3+ electrolytes, [Ru(dcb) 2(NMI-phen)] 2+ outperformed [Ru(dcb) 3] 2+ in solar cell efficiency in devices. A record APCE (25%) was achieved for a ruthenium photosensitizer in a p-type DSSC. Insights on photosensitizer regeneration kinetics are included.
Place, publisher, year, edition, pages
2012. Vol. 41, no 42, 13105-13111 p.
1, 10-phenanthroline, Charge recombinations, Charge separations, Dicarboxylic acid, Donor-acceptors, Dye-Sensitized solar cell, Dye-sensitized solar cells, Electron-accepting, P-type, Phenanthrolines, Photophysical, Photovoltaic performance, Reduced-state, Ruthenium polypyridyl complexes, Solar cell efficiencies, Valence-band holes, Photoelectrochemical cells, Ruthenium, Ruthenium compounds, Solar cells, Photosensitizers
IdentifiersURN: urn:nbn:se:uu:diva-184904DOI: 10.1039/c2dt30829kISI: 000309615200012OAI: oai:DiVA.org:uu-184904DiVA: diva2:570768