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Red-Absorbing Cationic Acceptor Dyes for Photocathodes in Tandem Solar Cells

Lookup NU author(s): Professor Ming-Qi Cheng, Professor Elizabeth GibsonORCiD


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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.

Publication metadata

Author(s): Wood CJ, Cheng M, Clark CA, Horvath R, Clark IP, Hamilton ML, Towrie M, George MW, Sun L, Yang X, Gibson EA

Publication type: Article

Publication status: Published

Journal: The Journal of Physical Chemistry Part C

Year: 2014

Volume: 118

Issue: 30

Pages: 16536-16546

Print publication date: 03/11/2014

Online publication date: 20/03/2014

ISSN (print): 1932-7447

ISSN (electronic): 1932-7455

Publisher: American Chemical Society


DOI: 10.1021/jp4119937


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