Highly Efficient Porphyrin Sensitizers for Dye-Sensitized Solar Cells



Publication Details

Campbell, W. M., Jolley, K. W., Wagner, P. W., Wagner, K. K., Walsh, P., Gordon, K. C., Schmidt-Mende, L., Nazeeruddin, M. K., Wang, Q., Graetzel, M. & Officer, D. L. (2007). Highly Efficient Porphyrin Sensitizers for Dye-Sensitized Solar Cells. The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 111 (32), 11760-11762.


In TiO2-based dye-sensitized nanocryst. solar cells, efficiencies of up to 11% were obtained using Ru dyes, but the limited availability of these dyes together with their undesirable environmental impact led to the search for cheaper and safer org.-based dyes. In this Letter, the authors report the synthesis, electronic, and photovoltaic properties of novel green porphyrin sensitizers. All six porphyrin dyes give solar cell efficiencies of ³5%, but the best performing dye under std. global AM 1.5 solar conditions gives a short circuit photocurrent d. (Jsc) of 14.0 ± 0.20 mA/cm2, an open circuit voltage of 680 ± 30 mV, and a fill factor of 0.74, corresponding to an overall conversion efficiency of 7.1%, which, for porphyrin-based sensitizers, is unprecedented. This same dye gives an efficiency of 3.6% in a solid-state cell with spiro-MeOTAD as the hole transporting component, comparable to solid-state cells incorporating the best performing ruthenium dyes.

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