RT Journal Article
T1 Catalysis of Recombination and Its Limitation on Open Circuit Voltage for Dye Sensitized Photovoltaic Cells Using Phthalocyanine Dyes
A1 O'Regan, Brian C.
A1 López Duarte, Ismael
A1 Martínez Díaz, María Victoria
A1 Forneli Rubio, María Ámparo
A1 Albero Sancho, Josep
A1 Morandeira Ramírez, Ana
A1 Palomares Gil, Emilio
A1 Torres Cebada, Tomás
A1 Durrant, James Robert
AB 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.
PB American Chemical Society
SN 0002-7863
YR 2008
FD 2008
LK https://hdl.handle.net/20.500.14352/99779
UL https://hdl.handle.net/20.500.14352/99779
LA eng
NO 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.
NO Engineering and Physical Sciences Research Council (Reino Unido)
NO Ministerio de Educación, Cultura y Deporte (España)
NO European Commission
NO Ministerio de Ciencia, Innovación y Universidades (España)
NO Comunidad de Madrid
DS Docta Complutense
RD 17 jul 2024