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Issue 15, 2014
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Structural tuning of ancillary chelate in tri-carboxyterpyridine Ru(ii) sensitizers for dye sensitized solar cells

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Abstract

Three distinct classes of ancillary chelates, namely: 2-(3-trifluoromethylpyrazol-5-yl)-6-(3-trifluoromethylphenyl)pyridine (L3, H2pzppy), 4-(3-trifluoromethylpyrazol-5-yl)-2-(3-trifluoromethyl)phenylpyrimidine (L5, H2pzppm) and 4-(6-(3-trifluoromethylpyrazol-5-yl)pyridin-2-yl)-2-trifluoromethylpyrimidine (L6, H2pzpypm), which showed an identical skeletal topology, but with the more electronegative nitrogen atom replacing the isoelectronic methine group at the selected skeletal position, were obtained to investigate the photophysical and electrochemical properties and hence the associated Ru(II) sensitizers based DSCs. To increase the optical absorptivity we also strategically added thiophene (thienyl) or 3,4-ethylenedioxythiophene (EDOT) appendages to L6, for boosting the short-circuit photocurrent (JSC) and the overall efficiency (η) of the fabricated DSC devices. Under AM 1.5G illumination, the best sensitizer showed performance data of JSC = 18.11 mA cm−2, VOC = 0.66 V, FF = 0.729 and η = 8.72%, and a good cell stability at 60 °C for 1000 hours, being only decreased by ∼5% in the η value.

Graphical abstract: Structural tuning of ancillary chelate in tri-carboxyterpyridine Ru(ii) sensitizers for dye sensitized solar cells

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Supplementary files

Article information


Submitted
25 Nov 2013
Accepted
20 Jan 2014
First published
21 Jan 2014

J. Mater. Chem. A, 2014,2, 5418-5426
Article type
Paper
Author version available

Structural tuning of ancillary chelate in tri-carboxyterpyridine Ru(II) sensitizers for dye sensitized solar cells

C. Chou, P. Chen, F. Hu, Y. Chi, S. Ho, J. Kai, S. Liu and P. Chou, J. Mater. Chem. A, 2014, 2, 5418
DOI: 10.1039/C3TA14876A

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