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Comparison of charge transfer dynamics in polypyridyl ruthenium sensitizers for solar cells and water splitting systems

Abstract

Standard ruthenium components of dye-sensitized solar cells (sensitizer N719) and dye-sensitized photoelectrochemical cells (sensitizer RuP and water oxidation catalyst RuOEC) are investigated in the same solar cell configuration to compare their photodynamics and charge separation efficiency. The samples are studied on time scales from femtoseconds to seconds by means of transient absorption, time-resolved emission and electrochemical impedance measurements. RuP shows significantly slower electron injection into mesoporous titania electrode and enhanced fast (sub-ns) electron recombination with respect to those of N719. Moreover, RuOEC is found to be responsible for partial light absorption and electron injection with low efficiency. The obtained results reveal new insights into the reasons of lower charge separation efficiency in water splitting systems with respect to that than in solar cells. The important role of the initial processes occurring at dye-titania interface within the first nanoseconds in this efficiency is emphasized.

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Publication details

The article was received on 12 Jan 2018, accepted on 12 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C8CP00258D
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Comparison of charge transfer dynamics in polypyridyl ruthenium sensitizers for solar cells and water splitting systems

    I. Grądzka, M. Gierszewski, J. Karolczak and M. Ziolek, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP00258D

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