Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 5, Issue 4, Pages 6290-6293Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee02540f
Keywords
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Funding
- China Natural Science Foundation [21076039]
- National Basic Research Program of China [2009CB220009]
- Ministry of Science and Technology (MOST) [2001CCA02500]
- Swedish Energy Agency
- K&A Wallenberg Foundation
- State Key Laboratory of Fine Chemicals [KF0805]
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A new iodine-free electrolyte based on amino acids L-cysteine/L-cystine as a redox couple has been designed and synthesized. DSSCs fabricated with the conventional I-/I-3(-) redox couple gave efficiencies of 8.1% and 6.3% under optimized experimental conditions based on ruthenium dye, N719, and metal-free organic dye, TH202, respectively. Based on the same dyes, the DSSCs employing the new L-cysteine/L-cystine redox couple showed comparable efficiencies of 7.7% and 5.6%, respectively. However, higher incident-photon-to-electron (IPCE) conversion efficiencies and larger J(sc) values were found for devices with the L-cysteine/L-cystine redox couple than with I-/I-3(-). From an electrochemical impedance spectroscopic study, we found that the charge recombination between the conduction band electrons in the TiO2 film and the electrolyte containing the L-cysteine/L-cystine redox couple is restrained.
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