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Open AccessReview

Metal Coordination Complexes as Redox Mediators in Regenerative Dye-Sensitized Solar Cells

1
Laboratory of Photomolecular Science, Institute of Chemical Science and Engineering, Swiss Federal Institute of Technology in Lausanne (EPFL), Chemin des Alambics, Station 6, CH-1015 Lausanne, Switzerland
2
Laboratory of Photonics and Interfaces, Institute of Chemical Science and Engineering, Swiss Federal Institute of Technology in Lausanne (EPFL), Chemin des Alambics, Station 6, CH-1015 Lausanne, Switzerland
*
Authors to whom correspondence should be addressed.
Inorganics 2019, 7(3), 30; https://doi.org/10.3390/inorganics7030030
Received: 12 December 2018 / Revised: 16 January 2019 / Accepted: 17 January 2019 / Published: 26 February 2019
(This article belongs to the Collection Coordination Complexes for Dye-Sensitized Solar Cells (DSCs))
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Abstract

Dye-sensitized solar cells (DSSCs) have attracted a substantial interest in the last 30 years for the conversion of solar power to electricity. An important component is the redox mediator effecting the transport of charge between the photoelectrode and the dark counter electrode (CE). Among the possible mediators, metal coordination complexes play a prominent role and at present are incorporated in several types of devices with a power conversion efficiency exceeding 10%. The present review, after a brief introduction to the operation of DSSCs, discusses at first the requirements for a successful mediator. Subsequently, the properties of various classes of inorganic coordination complexes functioning as mediators relevant to DSSC operation are presented and the operational characteristics of DSSC devices analyzed. Particular emphasis is paid to the two main classes of efficient redox mediators, the coordination complexes of cobalt and copper; however other less efficient but promising classes of mediators, notably complexes of iron, nickel, manganese and vanadium, are also presented. View Full-Text
Keywords: dye sensitized solar cell; electrochemical photovoltaic cell; redox mediator; hole conductor; electron transfer; electron hopping dye sensitized solar cell; electrochemical photovoltaic cell; redox mediator; hole conductor; electron transfer; electron hopping
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Saygili, Y.; Stojanovic, M.; Flores-Díaz, N.; Zakeeruddin, S.M.; Vlachopoulos, N.; Grätzel, M.; Hagfeldt, A. Metal Coordination Complexes as Redox Mediators in Regenerative Dye-Sensitized Solar Cells. Inorganics 2019, 7, 30.

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