Ru-based donor-acceptor photosensitizer that retards charge recombination in a p-type dye-sensitized solar cell

Jonathan C. Freys, James M. Gardner, Luca D'Amario, Allison M. Brown, Leif Hammarström

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)13105-13111
Number of pages7
JournalDalton Transactions
Volume41
Issue number42
DOIs
Publication statusPublished - Nov 14 2012

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Photosensitizing Agents
Ruthenium
Dicarboxylic Acids
Phenanthrolines
Electrons
Valence bands
Electrolytes
Solar cells
Dye-sensitized solar cells
Kinetics

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Ru-based donor-acceptor photosensitizer that retards charge recombination in a p-type dye-sensitized solar cell. / Freys, Jonathan C.; Gardner, James M.; D'Amario, Luca; Brown, Allison M.; Hammarström, Leif.

In: Dalton Transactions, Vol. 41, No. 42, 14.11.2012, p. 13105-13111.

Research output: Contribution to journalArticle

Freys, Jonathan C. ; Gardner, James M. ; D'Amario, Luca ; Brown, Allison M. ; Hammarström, Leif. / Ru-based donor-acceptor photosensitizer that retards charge recombination in a p-type dye-sensitized solar cell. In: Dalton Transactions. 2012 ; Vol. 41, No. 42. pp. 13105-13111.
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abstract = "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.",
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