http://dx.doi.org/10.1039/c0dt01043j">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Heteroleptic ruthenium complexes containing uncommon 5,5’-disubstituted-2,2’bipyridine chromophores for Ddye-sensitized solar cells

Language

English

Abstract

Four new heteroleptic ruthenium sensitizers [Ru(4,4′-carboxylic acid-2,2′-bipyridine)(L)(NCS)2] (L = 5,5′-bis(4- octylthiophen-2-yl)-2,2′-bipyridine (1), 5,5′-bis(N,N-diphenyl-4- aminophenyl)-2,2′-bipyridine (2), 5,5′-bis(5-(N,N-diphenyl-4- aminophenyl)-thiophen-2-yl)-2,2′-bipyridine (3) and 5,5′-bis(4- octyl-5-(N,N-diphenyl-4-aminophenyl)-thiophen-2-yl)-2,2′-bipyridine (4)) were synthesized, characterized by physicochemical and computational methods, and utilized as photosensitizers in nanocrystalline dye-sensitized solar cells (DSSCs). The λmax of the metal-to-ligand charge transfer (MLCT) absorption of these four ruthenium dyes (527 nm for 1, 535 nm for 2, 585 nm for 3 and 553 nm for 4) can be tuned by various structural modifications of the ancillary ligand and it was shown that increasing the conjugation length of such ligand reduces the energy as well as the molar absorption coefficient of the MLCT band. The maximum incident photon to current conversion efficiency (IPCE) of 41.4% at 550 nm, 38.6% at 480 nm, 39.4% at 470 nm and 31.1% at 480 nm for 1-, 2-, 3- and 4-sensitized solar cells were obtained. Respectable power conversion efficiencies of 3.00%, 2.51%, 2.00% and 2.03% were realized, respectively, when the sensitizers 1, 2, 3 and 4 were used in DSSCs under the standard air mass (AM) 1.5 sunlight illumination (versus 5.9% for standard N719). © 2011 The Royal Society of Chemistry.

Publication Date

2010

Source Publication Title

Dalton Transactions

Volume

40

Issue

10

Start Page

2314

End Page

2323

Publisher

Royal Society of Chemistry

ISSN (print)

14779226

ISSN (electronic)

14779234

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