Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 18, Issue 25, Pages 7862-7868Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201103904
Keywords
carbides; energy conversion; organic redox couple; quantum dots; solar cells
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Funding
- NSFC [50773008]
- State Key Laboratory of New Ceramic and Fine Processing (Tsinghua University)
- National High Technology Research and Development Program for Advanced Materials of China [2009AA03Z220]
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Low-cost quantum-dot sensitized solar cells (QDSSCs) were fabricated by using the earth-abundant element SnS quantum dot, novel TiC counter electrodes, and the organic disulfide/thiolate (T2/T-) redox couple, and reached an efficiency of 1.03?%. QDSSCs based on I-/I3-, T2/T-, and S2-/Sx2- redox couples were assembled to study the role of the redox couples in the regeneration of sensitizers. Charge-extraction results reveal the reasons for the difference in JSC in three QDSSCs based on I-/I3-, T2/T-, and S2-/Sx2- redox couples. The catalytic selectivity of TiC and Pt towards T2/T- and I-/I3- redox couples was investigated using Tafel polarization and electrochemical impedance analysis. These results indicated that Pt and TiC show a similar catalytic selectivity for I-/I3-. However, TiC possesses better catalytic activity for T2/T- than for I-/I3-. These results indicate the great potential of transition metal carbide materials and organic redox couples used in QDSSCs.
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