Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Ruthenium(II) photosensitizers with electron-rich diarylamino-functionalized 2,2′-bipyridines and their application in dye-sensitized solar cells

Language

English

Abstract

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.New ruthenium(II) photosensitizers [Ru(dcbpy)(L)(NCS)2] (dcbpy = 4,4′-dicarboxylic acid-2,2′-bipyridine; L = 4,4′-bis{di[4-(N,N′-dimethylamino)phenyl]amino}-2,2′-bipyridine (1), 4,4′-bis[di(4-methoxyphenyl)amino]-2,2′-bipyridine (2), and 4,4′-bis[di(4-tolyl)amino]-2,2′-bipyridine (3)) were prepared and characterized and their application in dye-sensitized solar cells is presented. The optical absorption of these photosensitizers gives a peak at around 540 nm, which is very similar to that of the standard N719. The maximum incident photon-to-current conversion efficiency (IPCE) of 80.6% was obtained for 3, which corresponded to a power conversion efficiency (η) of 5.68% under standard air mass (AM) 1.5 sunlight (versus N719 at 6.76%). Molecular cosensitization of 3 with an organic dye, QS-DPP-I, yielded higher η values up to 6% relative to the cells based on individual photosensitizers, and the corresponding IPCE can reach 93.6% at 549 nm. A preliminary stability test of the devices was also conducted.

Keywords

Charge transfer, Density functional calculations, Ligand effects, Ruthenium, Sensitizers, Solar cells

Publication Date

2014

Source Publication Title

European Journal of Inorganic Chemistry

Volume

2014

Issue

31

Start Page

5322

End Page

5330

Publisher

Wiley-VCH Verlag

DOI

10.1002/ejic.201402396

Link to Publisher's Edition

http://dx.doi.org/10.1002/ejic.201402396

ISSN (print)

14341948

ISSN (electronic)

10990682

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