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Earth-Abundant Cobalt Pyrite (CoS2) Thin Film on Glass as a Robust, High-Performance Counter Electrode for Quantum Dot-Sensitized Solar Cells

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    Earth-Abundant Cobalt Pyrite (CoS2) Thin Film on Glass as a Robust, High-Performance Counter Electrode for Quantum Dot-Sensitized Solar Cells
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    † Department of Chemistry, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
    ‡ Radiation Laboratory, Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
    *E-mail: [email protected]
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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2013, 4, 11, 1843–1849
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    https://doi.org/10.1021/jz400642e
    Published May 9, 2013
    Copyright © 2013 American Chemical Society
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    Abstract

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    We report a cobalt pyrite (cobalt disulfide, CoS2) thin film on glass as a robust, high-performance, low-cost, earth-abundant counter electrode for liquid-junction quantum dot-sensitized solar cells (QDSSCs) that employ the aqueous sulfide/polysulfide (S2–/Sn2–) redox electrolyte as the hole-transporting medium. The metallic CoS2 thin film electrode is prepared via thermal sulfidation of a cobalt film deposited on glass and has been characterized by powder X-ray diffraction and electron microscopy. Using the CoS2 counter electrode, CdS/CdSe-sensitized QDSSCs display improved short-circuit photocurrent density and fill factor, achieving solar light-to-electricity conversion efficiencies as high as 4.16%, with an average efficiency improvement of 54 (±14)% over equivalent devices assembled with a traditional platinum counter electrode. Electrochemical measurements verify that CoS2 shows high electrocatalytic activity toward polysulfide reduction, rationalizing the improved QDSSC performance. CoS2 is also less susceptible to poisoning by the sulfide/polysulfide electrolyte, a problem that plagues platinum electrodes in this application; furthermore, CoS2 exhibits excellent stability in sulfide/polysulfide electrolyte, resulting in highly reproducible performance.

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    Supporting Information

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    Mesoscopic TiO2 photoanode preparation and sensitization procedures; demonstrations of QDSSC stability, reproducibility, and improved performance when using the CoS2 counter electrode; IPCE action spectra for QDSSCs assembled with either a CoS2 or a Pt CE; and CV characterization of CoS2 and Pt symmetrical cells filled with diluted sulfide/polysulfide electrolyte. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Cite this: J. Phys. Chem. Lett. 2013, 4, 11, 1843–1849
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