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High extinction coefficient ``Antenna'' dye in solid-state dye-sensitized solar cells: A photophysical and electronic study

Snaith, Henry J. and Karthikeyan, C. S. and Petrozza, Annamaria and Teuscher, Joeel and Moser, Jacques E. and Nazeeruddin, Mohammad K. and Thelakkat, Mukundan and Graetzel, Michael (2008) High extinction coefficient ``Antenna'' dye in solid-state dye-sensitized solar cells: A photophysical and electronic study. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (20). pp. 7562-7566.

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Abstract

We present a photophysical and device-based investigation of a new bipyridyl−NCS ruthenium complex sensitizer with an extended π system, in both sensitized TiO2 and incorporated into solid-state dye-sensitized solar cells. We compare this new sensitizer to an analog dye without the extended π system. We observe very similar excited-state absorption spectra and charge recombination kinetics for the two systems. However, the π-extended senstizer has a phenomenally enhanced molar extinction coefficient which translates into far greater light harvesting and current collection in solid-state dye-sensitized solar cells. We also infer from transient photovoltage measurements that positioning the pendent extended π system away from the TiO2 surface has induced a favorable dipole shift, generating enhanced open-circuit voltage. The resulting power conversion efficiency for the solar cell has been increased from 2.4% to 3.2% when comparing the new sensitizer to an analogy with no pendent group.

Item Type:Article
Uncontrolled Keywords:dye sensitized solar cells - bipyridyl-NCS ruthenium complex
Subjects:Technology > Nanotechnology and energy applications
Material Science > Nanochemistry
ID Code:6067
Deposited By:IoN
Deposited On:27 Aug 2009 10:04
Last Modified:27 Aug 2009 10:04

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