2026-06-28T00:02:36Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/997792025-08-28T12:58:00Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author O'Regan, Brian C. author López Duarte, Ismael author Martínez Díaz, María Victoria author Forneli Rubio, María Ámparo author Albero Sancho, Josep author Morandeira Ramírez, Ana author Palomares Gil, Emilio author Torres Cebada, Tomás author Durrant, James Robert 2024-02-07T09:01:44Z 2024-02-07T09:01:44Z 2008 O’Regan BC, López-Duarte I, Martínez-Díaz MV, Forneli A, Albero J, Morandeira A, et al. Catalysis of Recombination and Its Limitation on Open Circuit Voltage for Dye Sensitized Photovoltaic Cells Using Phthalocyanine Dyes. J Am Chem Soc 2008;130:2906–7. https://doi.org/10.1021/ja078045o. 0002-7863 10.1021/ja078045o https://hdl.handle.net/20.500.14352/99779 1520-5126 https://doi.org/10.1021/ja078045o In order to increase the energy efficiency of dye-sensitized solar cells beyond 10%, an improved dye needs to be developed with greater light absorption in the red and near-infrared. Many dyes have been tested for this purpose; however, no dye with significant absorption beyond 750 nm has functioned properly. We have examined a series of ruthenium phthalocyanines, a dye class with large and tunable absorption in the red. For these dyes we observe a large reduction in the output voltage of the cells relative to the benchmark dye (N719). By examination of photovoltage transients and charge density measurements, we demonstrate that this reduction in voltage is caused by a 100-fold increase in the rate constant for recombination (iodine reduction) at the TiO2/electrolyte interface. N719, however, does not seem to catalyze this reaction. By examination of the literature, we propose that catalysis of the recombination reaction may be occurring for many other classes of potentially useful dyes including porphyrins, coumarins, perylenes, cyanines, merocyanines, and azulene. This widespread ability of the dye to catalyze recombination has not been appreciated before. This finding has important implications for future work to improve the red response of dye sensitized photovoltaics. eng Catalysis of Recombination and Its Limitation on Open Circuit Voltage for Dye Sensitized Photovoltaic Cells Using Phthalocyanine Dyes journal article 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