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

Freys, Jonathan C.Uppsala universitet,Fysikalisk kemi,Uppsala University (author)

QC 20121115
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.

Gardner, James M.,1982-KTH,Uppsala universitet,Institutionen för kemi - Ångström,Tillämpad fysikalisk kemi(Swepub:kth)u1r55ysm (author)
D'Amario, LucaUppsala universitet,Institutionen för kemi - Ångström,Uppsala University (author)
Brown, Allison M.Uppsala universitet,Fysikalisk kemi,Uppsala University(Swepub:uu)allbr429 (author)
Hammarström, LeifUppsala universitet,Fysikalisk kemi,Uppsala University(Swepub:uu)leifhamm (author)
Uppsala universitetFysikalisk kemi (creator_code:org_t)

In:Dalton Transactions: Royal Society of Chemistry (RSC)41:42, s. 13105-131111477-92261477-9234

By the author/editor: Freys, Jonathan ...; Gardner, James M ...; D'Amario, Luca; Brown, Allison M ...; Hammarström, Lei ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

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