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Two-dimensional photocurrent and transmission mapping of aqueous dye-sensitized solar cells


Reference:

Risbridger, T.A.G., Castro, F.A. and Cameron, P. J., 2012. Two-dimensional photocurrent and transmission mapping of aqueous dye-sensitized solar cells. Journal of Physical Chemistry C, 116 (42), pp. 22253-22260.

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    Official URL:

    http://dx.doi.org/10.1021/jp308238p

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    Abstract

    There is currently renewed interest in aqueous dye-sensitized solar cells (DSCs). Water ingress in conventional DSCs leads to a loss of efficiency; one solution to this problem is to optimize the cells to work in the presence of water. The aim is to create a stable cell and to avoid the need for buffer layers and encapsulation that increase device cost. Water containing electrolytes generally give lower photocurrents than those based on organic solvents, a problem that has in part been attributed to poor pore filling by the aqueous electrolyte. Here, two sets of cells have been made that are identical except for the nature of the solvent (water or acetonitrile). Photocurrent mapping has been used to compare spatially resolved inhomogeneities in the current density. High-resolution transmission mapping (3906 data points/cm2) has been used to decouple dye coverage and film thickness from electrolyte permeation. Filling cells using heating and vacuum was found to improve water electrolyte permeation. Photocurrent maps suggest that dye desorption occurs adjacent to the filling holes in both acetonitrile- and water-based cells, with significantly more dye desorbed in the water-based cells. The loss of dye was attributed to desorption by the tert-butyl pyridine base in the electrolyte.

    Details

    Item Type Articles
    CreatorsRisbridger, T.A.G., Castro, F.A. and Cameron, P. J.
    DOI10.1021/jp308238p
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    URLURL Type
    http://www.scopus.com/inward/record.url?scp=84867879038&partnerID=8YFLogxKUNSPECIFIED
    DepartmentsFaculty of Science > Chemistry
    Research CentresCentre for Sustainable Chemical Technologies
    Publisher StatementCameron_JPCC_2012.pdf: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C , copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/jp308238p
    RefereedYes
    StatusPublished
    ID Code33407

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