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.
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.
|Uncontrolled Keywords:||dye sensitized solar cells - bipyridyl-NCS ruthenium complex|
|Subjects:||Technology > Nanotechnology and energy applications|
Material Science > Nanochemistry
|Deposited On:||27 Aug 2009 10:04|
|Last Modified:||27 Aug 2009 10:04|
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