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  4. Intramolecular Charge-Transfer Tuning of Perylenes: Spectroscopic Features and Performance in Dye-Sensitized Solar Cells
 
research article

Intramolecular Charge-Transfer Tuning of Perylenes: Spectroscopic Features and Performance in Dye-Sensitized Solar Cells

Edvinsson, Tomas
•
Li, Chen
•
Pschirer, Neil
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2007
Journal of Physical Chemistry C

Five novel perylene mols. with different intramol. charge-transfer (ICT) characters have been synthesized. The relation between the ICT character for different donating groups and the results for their electro- and photochem. properties as well as their performance in nanostructured dye-sensitized solar cells (nDSC) are reported. With the stronger donors, we obtain a shift of the LUMO to more neg. potential vs. normal hydrogen electrode (NHE) as well as an increased charge sepn. in the dye upon excitation. Ab initio calcns. were used to analyze the effects on orbital energies and electron distribution with the different donors. Incorporating the dyes in nDSCs, we see a drastic improvement in the performance for the more polar dyes. In particular, we find a much improved photovoltage because of higher LUMO levels, allowing conduction band tuning in the TiO2 as well as a contribution from the permanent dipoles in the dyes. The photocurrent improves remarkably with increasing ICT character of the dyes. The external quantum efficiency reached over 70%, and the overall solar-to-elec. energy conversion efficiency was improved to almost 4% for the dye with highest ICT character, which can be compared with devices with the std. N719 dye (Ru(dcbpy)2(NCS)2) showing 6% under similar conditions. The performance is a significant improvement compared to previous reports for perylenes and lifts the performance from modest to promising. Initial stability tests show that the dye with the highest performance was spectrally stable after more than 2000 h of irradn. in a solar-cell device.

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Type
research article
DOI
10.1021/jp076447c
Author(s)
Edvinsson, Tomas
Li, Chen
Pschirer, Neil
Schoeneboom, Jan
Eickemeyer, Felix
Sens, Ruediger
Boschloo, Gerrit
Herrmann, Andreas
Muellen, Klaus
Hagfeldt, Anders  
Date Issued

2007

Published in
Journal of Physical Chemistry C
Volume

111

Start page

15137

End page

15140

Subjects

perylene solar cell dye intramol charge transfer

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LSPM  
Available on Infoscience
July 6, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/115734
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