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Issue 24, 2016
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Efficiency and stability of spectral sensitization of boron-doped-diamond electrodes through covalent anchoring of a donor–acceptor organic chromophore (P1)

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Abstract

A novel procedure is developed for chemical modification of H-terminated B-doped diamond surfaces with a donor–π-bridge–acceptor molecule (P1). A cathodic photocurrent near 1 μA cm−2 flows under 1 Sun (AM 1.5) illumination at the interface between the diamond electrode and aqueous electrolyte solution containing dimethylviologen (electron mediator). The efficiency of this new electrode outperforms that of the non-covalently modified diamond with the same dye. The found external quantum efficiency of the P1-sensitized diamond is not far from that of the flat titania electrode sensitized by a standard organometallic dye used in solar cells. However, the P1 dye, both pure and diamond-anchored, shows significant instability during illumination by solar light. The degradation is a two-stage process in which the initially photo-generated products further decompose in complicated dark reactions. These findings need to be taken into account for optimization of organic chromophores for solar cells in general.

Graphical abstract: Efficiency and stability of spectral sensitization of boron-doped-diamond electrodes through covalent anchoring of a donor–acceptor organic chromophore (P1)

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Publication details

The article was received on 04 Apr 2016, accepted on 23 May 2016 and first published on 24 May 2016


Article type: Paper
DOI: 10.1039/C6CP02209J
Citation: Phys. Chem. Chem. Phys., 2016,18, 16444-16450
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    Efficiency and stability of spectral sensitization of boron-doped-diamond electrodes through covalent anchoring of a donor–acceptor organic chromophore (P1)

    H. Krysova, J. Barton, V. Petrak, R. Jurok, M. Kuchar, P. Cigler and L. Kavan, Phys. Chem. Chem. Phys., 2016, 18, 16444
    DOI: 10.1039/C6CP02209J

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