Red-Absorbing Cationic Acceptor Dyes for Photocathodes in Tandem Solar Cells
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
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.
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
IdentifiersURN: urn:nbn:se:kth:diva-149977DOI: 10.1021/jp4119937ISI: 000339930900030ScopusID: 2-s2.0-84905457055OAI: oai:DiVA.org:kth-149977DiVA: diva2:742450
QC 201409012014-09-012014-08-292014-09-01Bibliographically approved