Cu2-xS films as counter-electrodes for dye solar cells with ferrocene-based liquid electrolytes

Thin Solid Films Volume: 612 Pages: 22-28 Published: 2016

The corrosion of Cu2−xS electrodes by HSE. On the surface of a Cu2−xS electrode (a) a small drop of the iodine-based HSE is dropped (b). The electrode has been let to react with HSE during 10 min (c), then is washed with absolute ethanol (d).

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Writers: M. Congiu and O. Nunes-Neto and M.L. De Marco and D. Dini and C.F.O. Graeff

Keywords: Copper sulphide; Solar energy; Counter-electrodes; Ferrocene; Dye solar cells;

Abstract: In this work, the application of hexagonal CuS nanoparticle layers as counter electrodes for dye sensitized solar cells has been studied. A fast, cheap and reliable deposition method was proposed for the one-step preparation of Cu2 − xS layers on F-doped SnO2within 30 min through an ink-based technique. The electrodes prepared with our method were tested with iodine/iodide electrolyte, Co(II)/(III) bipyridine redox shuttle and Fe(II)/(III) ferrocene-based liquid electrolyte. The Cu2 − xS layers showed high efficiency and stability with the ferrocene/ferrocenium redox couple, showing a fast charge recombination kinetic, low charge transfer resistance (Rct = 0.73 Ω cm2), reasonably high limiting current (11.8 mA cm− 2) and high stability in propylene carbonate.

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