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Volume 185, 2015
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Photoelectrochemical properties of porphyrin dyes with a molecular dipole in the linker

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The electronic properties of three porphyrin–bridge–anchor photosensitizers are reported with (1a, 1e, 3a and 3e) or without (2a and 2e) an intramolecular dipole in the bridge. The presence and orientation of the bridge dipole is hypothesized to influence the photovoltaic properties due to variations in the intrinsic dipole at the semiconductor–molecule interface. Electrochemical studies of the porphyrin–bridge–anchor dyes self-assembled on mesoporous nanoparticle ZrO2 films, show that the presence or direction of the bridge dipole does not have an observable effect on the electronic properties of the porphyrin ring. Subsequent photovoltaic measurements of nanostructured TiO2 semiconductor films in dye sensitized solar cells show a reduced photocurrent for photosensitizers 1a and 3a containing a bridge dipole. However, cooperative increased binding of the 1a + 3a co-sensitized device demonstrates that dye packing overrides any differences due to the presence of the small internal dipole.

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The article was received on 18 May 2015, accepted on 15 Jun 2015 and first published on 16 Jun 2015

Article type: Paper
DOI: 10.1039/C5FD00082C
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Citation: Faraday Discuss., 2015,185, 497-506

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    Photoelectrochemical properties of porphyrin dyes with a molecular dipole in the linker

    K. T. Ngo, J. Rochford, H. Fan, A. Batarseh, K. Chitre, S. Rangan, R. A. Bartynski and E. Galoppini, Faraday Discuss., 2015, 185, 497
    DOI: 10.1039/C5FD00082C

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