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Artículo

Charge-transfer dynamics of fluorescent dye-sensitized electrodes under applied biases

Godin, Robert; Sherman, Benjamin D.; Bergkamp, Jesse J.; Chesta, Carlos AlbertoIcon ; Moore, Ana L.; Moore, Thomas A.; Palacios, Rodrigo EmilianoIcon ; Cosa, Gonzalo
Fecha de publicación: 07/2015
Editorial: American Chemical Society
Revista: Journal of Physical Chemistry Letters
ISSN: 1948-7185
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
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Resumen

The development of dye-sensitized solar cells requires an in-depth understanding of the interfacial charge-transfer dynamics that take place between dye sensitizers and semiconductors. Here, we describe a prototype system to probe these dynamics by monitoring in real time the fluorescence of two organic sensitizers, a perylene and a squaraine, bound to a SnO2 semiconductor thin film as a function of potentiostatic control of the Fermi level. The two different sensitizer fluorophores characterized by vastly different redox potentials undergo similar fluorescence modulation with applied bias, an indication that the density of states of the semiconductor largely influences the charge-transfer dynamics while energetics play a minimal role. We further show that the rate of photodegradation of the perylene sensitizer with applied bias provides a suitable marker to study the rate of charge injection and charge recombination. Taken together, our results demonstrate a suitable platform to visualize and study charge-transfer dynamics on films and constitute a step toward achieving single-molecule resolution in our quest to decipher the static and dynamic heterogeneity of charge-transfer dynamics in dye-sensitized photoanodes.
Palabras clave: Dye-Sensitized Solar Cells , Interdacial Charge-Transfer Dynamics , Perylene , Squaraine
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/69393
DOI: http://dx.doi.org/10.1021/acs.jpclett.5b01061
URL: https://pubs.acs.org/doi/10.1021/acs.jpclett.5b01061
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Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Citación
Godin, Robert; Sherman, Benjamin D.; Bergkamp, Jesse J.; Chesta, Carlos Alberto; Moore, Ana L.; et al.; Charge-transfer dynamics of fluorescent dye-sensitized electrodes under applied biases; American Chemical Society; Journal of Physical Chemistry Letters; 6; 14; 7-2015; 2688-2693
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