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Recombinación de carga interfacial entre e(-) -TiO2 y el electrolito I(-) / I3(-) en complejos heteroelépticos de

Anna Reynal¹, Amparo Forneli, Eugenia Martinez-Ferrero

¹Institute of Chemical Research of Catalonia, Avda. Països Catalans 16, Tarragona, Spain.

Journal of the American Chemical Society

|September 23, 2008

Resumen

Se estudiaron los complejos de polipiridil de rutenio (II) con grupos funcionales específicos por su impacto en el rendimiento de las células solares sensibilizadas al tinte. Ciertos complejos funcionalizados de rutenio aceleraron la recombinación de electrones, lo que obstaculizó la eficiencia del dispositivo.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
La fotoquímica es la fotoquímica.
La electroquímica es electroquímica.

Sus antecedentes:

Los complejos de polipiridil de rutenio (II) son cruciales en las células solares sensibilizadas al tinte (DSSC).
Comprender la transferencia de carga interfacial es clave para mejorar la eficiencia del DSSC.
Los ligandos de fenantrolina influyen en las propiedades de los complejos de rutenio.

Objetivo del estudio:

Para diseñar, sintetizar y caracterizar nuevos complejos heteroelépticos de rutenio (II) polipiridil.
Para investigar las propiedades espectroscópicas y electroquímicas de estos complejos.
Para dilucidar el efecto de los grupos funcionales en la transferencia de carga interfacial en DSSCs.

Principales métodos:

Síntesis y caracterización de los complejos polipiridil de rutenio (II).
Análisis espectroscópico y electroquímico en solución y en superficies de semiconductores.
Cuenta de fotones únicos con resolución de tiempo y espectroscopia de transientes láser.
Mediciones de fotovoltaje inducido por la luz.

Principales resultados:

Se sintetizaron complejos de rutenio con grupos de donación de electrones (-NH2) y de retirada de electrones (-NO2).
Estos complejos funcionalizados alteraron significativamente los procesos de transferencia de carga interfacial.
Se mejoró la recombinación de electrones entre los electrones fotoinyectados y el electrolito redox yoduro/trioduro (I-/I3-).
El rendimiento del dispositivo estaba limitado por estas reacciones de recombinación acelerada.

Conclusiones:

La presencia de grupos funcionales específicos en los complejos de rutenio afecta críticamente la dinámica de transferencia de carga interfacial en los DSSC.
Los grupos de donación y retirada de electrones pueden promover vías de recombinación de electrones perjudiciales.
El diseño posterior de los complejos de rutenio debe considerar minimizar estas vías de recombinación para mejorar la eficiencia del dispositivo.

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