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Red-Absorbing Cationic Acceptor Dyes for Photocathodes in Tandem Solar Cells
DUT-KTH Joint Research Centre on Molecular Devices, State Key Laboratory of Fine Chemicals, Dalian University of Technology (DUT), China .
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2014 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 30, 16536-16546 p.Article in journal (Refereed) Published
Abstract [en]

A pair of new donor-pi-acceptor dyes that absorb toward the red region of the visible spectrum (CAD 1 and CAD 2) utilizing indolium cationic acceptor units have been synthesized for use in p-type dye-sensitized solar cells (p-DSC). Their optical and electrochemical properties were determined experimentally, including application of ultrafast transient absorption and time-resolved infrared spectroscopies. Our results are supported by computational modeling. NiO-based p-DSCs with CAD 1 and CAD 2 gave short-circuit photocurrent densities of 3.6 and 3.3 mA cm(-2), respectively, which are substantially higher than that of any previous red-absorbing p-DSC. These results are a step toward tandem dye-sensitized solar cells that absorb higher-energy photons at the TiO2 anode and lower-energy photons at the NiO cathode. Routes to further improve the efficiency of NiO DSCS are also discussed.

Place, publisher, year, edition, pages
2014. Vol. 118, no 30, 16536-16546 p.
Keyword [en]
Dye-sensitized solar cells, Electrodes, Field emission cathodes, Photons, Computational model, Dye-Sensitized solar cell, Short-circuit photocurrent densities, Tandem solar cells, Time resolved infrared spectroscopy, Transient absorption, Ultra-fast, Visible spectra
National Category
Physical Chemistry
URN: urn:nbn:se:kth:diva-149977DOI: 10.1021/jp4119937ISI: 000339930900030ScopusID: 2-s2.0-84905457055OAI: diva2:742450

QC 20140901

Available from: 2014-09-01 Created: 2014-08-29 Last updated: 2014-09-01Bibliographically approved

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Sun, Licheng
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