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)(2)N-(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.
Nanostructured Nio, Photovoltaic Devices, Redox Couple, Efficiency, Conversion, Films, Imide, Chromophores, Porphyrin, Behavior
Research subject SRA - Energy
IdentifiersURN: urn:nbn:se:kth:diva-104243DOI: 10.1039/c2dt30829kISI: 000309615200012PubMedID: 23018189ScopusID: 2-s2.0-84867348937OAI: oai:DiVA.org:kth-104243DiVA: diva2:563670
FunderStandUpSwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 201211152012-11-122012-10-312012-11-15Bibliographically approved