Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 32, Pages 10052-10064Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201402342
Keywords
donor-acceptor systems; dyes/pigments; energy conversion; sensitizers; solar cells
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Funding
- Ministry of Science and Technology of Taiwan [100-2113-M-001-024-MY3]
- Academia Sinica
- National Tsing Hua University
- National Taiwan University
- National Science Council of Taiwan [102-2811-M-001-123]
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The high performances of dye-sensitized solar cells (DSSCs) based on seven new dyes are disclosed. Herein, the synthesis and electrochemical and photophysical properties of a series of intentionally designed dipolar organic dyes and their application in DSSCs are reported. The molecular structures of the seven organic dyes are composed of a triphenylamine group as an electron donor, a cyanoacrylic acid as an electron acceptor, and an electron-deficient diphenylquinoxaline moiety integrated in the p-conjugated spacer between the electron donor and acceptor moieties. The DSSCs based on the dye DJ104 gave the best overall cell performance of 8.06%; the efficiency of the DSSC based on the standard N719 dye under the same experimental conditions was 8.82 %. The spectral coverage of incident photon-to-electron conversion efficiencies extends to the onset at the near-infrared region due to strong internal charge-transfer transition as well as the effect of electron-deficient diphenylquinoxaline to lower the energy gap in these organic dyes. A combined tetraphenyl segment as a hydrophobic barrier in these organic dyes effectively slows down the charge recombination from TiO2 to the electrolyte and boosts the photovoltage, comparable to their Ru-II counterparts. Detailed spectroscopic studies have revealed the dye structure-cell performance correlations, to allow future design of efficient light-harvesting organic dyes.
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