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

Autor:	Shih-Hung Liu, Yun Chi, Pei-Hua Chen, Fa-Chun Hu, Shu-Te Ho, Chun-Cheng Chou, Pi-Tai Chou, Ji-Jung Kai
Rok vydání:	2014
Předmět:	Photocurrent Renewable Energy Sustainability and the Environment General Chemistry Molar absorptivity Photochemistry Electrochemistry chemistry.chemical_compound Dye-sensitized solar cell chemistry Methine group Pyridine Thiophene General Materials Science Chelation
Zdroj:	J. Mater. Chem. A. 2:5418-5426
ISSN:	2050-7496 2050-7488
DOI:	10.1039/c3ta14876a
Popis:	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.
Databáze:	OpenAIRE
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