High Molar Extinction Coefficient Heteroleptic Ruthenium Complexes for Thin Film Dye-Sensitized Solar Cells
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- 作者：Daibin Kuang ; Seigo Ito ; Bernard Wenger ; Cedric Klein ; Jacques-E Moser ; Robin Humphry-Baker ; Shaik M. Zakeeruddin ; and Michael Grä ; tzel
- 刊名：Journal of the American Chemical Society
- 出版年：2006
- 出版时间：March 29, 2006
- 年：2006
- 卷：128
- 期：12
- 页码：4146 - 4154
- 全文大小：276K
- 年卷期：v.128,no.12(March 29, 2006)
- ISSN：1520-5126
文摘
Two novel heteroleptic sensitizers, Ru((4,4-dicarboxylic acid-2,2'-bipyridine)(4,4'-bis(p-hexyloxystyryl)-2,2-bipyridine)(NCS)2 and Ru((4,4-dicarboxylic acid-2,2'-bipyridine)(4,4'-bis(p-methoxystyryl)-2,2'-bipyridine) (NCS)2, coded as K-19 and K-73, respectively, have been synthesized and characterized by 1HNMR, FTIR, UV-vis absorption, and emission spectroscopy and excited-state lifetime and spectroelectrochemical measurements. The introduction of the alkoxystyryl group extends the conjugation of thebipyridine donor ligand increasing markedly their molar extinction coefficient and solar light harvestingcapacity. The dynamics of photoinduced charge separation following electronic excitation of the K-19 dyewas scrutinized by time-resolved laser spectroscopy. The electron transfer from K-19 to the conductionband of TiO2 is completed within 20 fs while charge recombination has a half-life time of 800 
s. The highextinction coefficients of these sensitizers enable realization of a new generation of a thin film dye sensitizedsolar cell (DSC) yielding high conversion efficiency at full sunlight even with viscous electrolytes based onionic liquids or nonvolatile solvents. An unprecedented yield of over 9% was obtained under standardreporting conditions (simulated global air mass 1.5 sunlight at 1000 W/m2 intensity) when the K-73 sensitizerwas combined with a nonvolatile "robust" electrolyte. The K-19 dye gave a conversion yield of 7.1% whenused in conjunction with the binary ionic liquid electrolyte. These devices exhibit excellent stability underlight soaking at 60 
C. The effect of the mesoscopic TiO2 film thickness on photovoltaic performance hasbeen analyzed by electrochemical impedance spectroscopy (EIS).
s. The highextinction coefficients of these sensitizers enable realization of a new generation of a thin film dye sensitizedsolar cell (DSC) yielding high conversion efficiency at full sunlight even with viscous electrolytes based onionic liquids or nonvolatile solvents. An unprecedented yield of over 9% was obtained under standardreporting conditions (simulated global air mass 1.5 sunlight at 1000 W/m2 intensity) when the K-73 sensitizerwas combined with a nonvolatile "robust" electrolyte. The K-19 dye gave a conversion yield of 7.1% whenused in conjunction with the binary ionic liquid electrolyte. These devices exhibit excellent stability underlight soaking at 60 C. The effect of the mesoscopic TiO2 film thickness on photovoltaic performance hasbeen analyzed by electrochemical impedance spectroscopy (EIS).