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research article

Increased light harvesting in dye-sensitized solar cells with energy relay dyes

Hardin, Brian E.
•
Hoke, Eric T.
•
Armstrong, Paul B.
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2009
Nature Photonics

Conventional dye-sensitized solar cells have excellent charge collection efficiencies, high open-circuit voltages and good fill factors. However, dye-sensitized solar cells do not completely absorb all of the photons from the visible and near-infrared domain and consequently have lower short-circuit photocurrent densities than inorganic photovoltaic devices. Here, we present a new design where high-energy photons are absorbed by highly photoluminescent chromophores unattached to the titania and undergo Forster resonant energy transfer to the sensitizing dye. This novel architecture allows for broader spectral absorption, an increase in dye loading, and relaxes the design requirements for the sensitizing dye. We demonstrate a 26% increase in power conversion efficiency when using an energy relay dye (PTCDI) with an organic sensitizing dye (TT1). We estimate the average excitation transfer efficiency in this system to be at least 47%. This system offers a viable pathway to develop more efficient dye-sensitized solar cells.

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Type
research article
DOI
10.1038/NPHOTON.2009.96
Web of Science ID

WOS:000268067700017

Author(s)
Hardin, Brian E.
Hoke, Eric T.
Armstrong, Paul B.
Yum, Jun-Ho  
Comte, Pascal  
Torres, Tomas
Frechet, Jean M. J.
Nazeeruddin, Md Khaja  
Graetzel, Michael  
McGehee, Michael D.
Date Issued

2009

Publisher

Nature Publishing Group

Published in
Nature Photonics
Volume

3

Start page

406

End page

411

Subjects

Nanocrystalline Tio2 Films

•

Titanium-Dioxide Films

•

Charge Recombination Kinetics

•

Electron Injection

•

Photovoltaic Cells

•

Conversion

•

Efficiency

•

Separation

•

Mechanism

•

Sunlight

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPI  
Available on Infoscience
November 30, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/60016
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