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Enhanced‐Light‐Harvesting Amphiphilic Ruthenium Dye for Efficient Solid‐State Dye‐Sensitized Solar Cells
Author(s) -
Wang Mingkui,
Moon SooJin,
Zhou Difei,
Le Formal Florian,
CeveyHa NgocLê,
HumphryBaker Robin,
Grätzel Carole,
Wang Peng,
Zakeeruddin Shaik M.,
Grätzel Michael
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200902396
Subject(s) - ruthenium , materials science , dye sensitized solar cell , molar absorptivity , photochemistry , bipyridine , energy conversion efficiency , ultrafast laser spectroscopy , carboxylate , absorption (acoustics) , conjugated system , spectroscopy , organic chemistry , optoelectronics , polymer , chemistry , electrode , catalysis , optics , crystal structure , electrolyte , composite material , physics , quantum mechanics
A ruthenium sensitizer (coded C101, NaRu (4,4′‐bis(5‐hexylthiophen‐2‐yl)‐2,2′‐bipyridine) (4‐carboxylic acid‐4′‐caboxylate‐2,2′‐bipyridine) (NCS) 2 ) containing a hexylthiophene‐conjugated bipyridyl group as an ancillary ligand is presented for use in solid‐state dye‐sensitized solar cells (SSDSCs). The high molar‐extinction coefficient of this dye is advantageous compared to the widely used Z907 dye, (NaRu (4‐carboxylic acid‐4′‐carboxylate) (4,4′‐dinonyl‐2,2′‐bipyridine) (NCS) 2 ). In combination with an organic hole‐transporting material (spiro‐MeOTAD, 2,2′,7,7′‐tetrakis‐( N , N ‐di‐ p ‐methoxyphenylamine) 9, 9′‐spirobifluorene), the C101 sensitizer exhibits an excellent power‐conversion efficiency of 4.5% under AM 1.5 solar (100 mW cm −2 ) irradiation in a SSDSC. From electronic‐absorption, transient‐photovoltage‐decay, and impedance measurements it is inferred that extending the π‐conjugation of spectator ligands induces an enhanced light harvesting and retards the charge recombination, thus favoring the photovoltaic performance of a SSDSC.