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Determination of the electron diffusion length in dye-sensitized solar cells by substrate contact patterning


Reference:

Dunn, H. K., Westin, P.-O., Staff, D. R., Peter, L. M., Walker, A. B., Boschloo, G. and Hagfeldt, A., 2011. Determination of the electron diffusion length in dye-sensitized solar cells by substrate contact patterning. Journal of Physical Chemistry C, 115 (28), pp. 13932-13937.

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    Official URL:

    http://dx.doi.org/10.1021/jp203296y

    Abstract

    A new method to estimate the electron diffusion length in dye-sensitized solar cells (DSCs) is presented. DSCs were fabricated on conducting glass substrates that were patterned by laser ablation of the fluorine-doped tin oxide coating to form parallel contact strips separated by uncontacted strips of the same width. The relative collection efficiency was measured as a function of the gap between the contact strips, which determines the lateral distance traveled by electrons to reach the contacts. To avoid complications arising from nonlinear recombination kinetics, current measurements were performed using small amplitude perturbations of the electron density close to open circuit and the maximum power point to minimize electron density gradients in the film. One and two-dimensional solutions of the continuity equation for electron transport and back reaction predict that the relative collection efficiency should fall as spacing between the contact strips exceeds the electron diffusion length and electrons are lost by back electron transfer during transit to the contacts. Measurements of the relative collection efficiency were fitted to the predicted dependence of the collection efficiency on the spacing between the contact strips to obtain the value of the electron diffusion length. The diffusion length is found to increase with voltage both at open circuit and at the maximum power point.

    Details

    Item Type Articles
    CreatorsDunn, H. K., Westin, P.-O., Staff, D. R., Peter, L. M., Walker, A. B., Boschloo, G. and Hagfeldt, A.
    DOI10.1021/jp203296y
    DepartmentsFaculty of Science > Chemistry
    Faculty of Science > Physics
    Publisher StatementPeter_J-Phys-Chem_2011_115_13922.pdf: This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Journal of Physical Chemistry C, copyright © American Chemical Society after peer review. To access the final edited and published work see http://dx.doi.org/10.1021/jp203296y
    RefereedYes
    StatusPublished
    ID Code25107

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