Publicación

Tipo de publicación: Artículos científicos (Publicados en revistas de divulgación o científicas)

Título del artículo: MECHANISMS OF ELECTRON TRANSPORT AND RECOMBINATION IN ZNO NANOSTRUCTURES FOR DYESENSITIZED SOLAR CELLS

Registrado por: CHEMPHYSCHEM

Año de publicación: 2014

Resumen: ZnO is an attractive material for applications in dye-sensitized solar cells and related devices. This material has excellent electron-transport properties in the bulk but its electron diffusion coefficient is much smaller in mesoporous films. In this work the electron-ransport properties of two different kinds of dyesensitized ZnO nanostructures are investigated by small-perturbation electrochemical techniques. For nanoparticulate ZnO photoanodes prepared via a wet-chemistry technique, the diffusion coefficient is found to reproduce the typical behavior predicted by the multiple-trapping and the hopping models, with an exponential increase with respect to the applied bias.
In contrast, in ZnO nanostructured thin films of controlled texture and crystallinity prepared via a plasma chemical vapor deposition method, the diffusion coefficient is found to be independent of the electrochemical bias. This observation suggests a different transport mechanism not controlled by trapping and electron accumulation. In spite of the quite different transport features, the recombination kinetics, the electron-collection
efficiency and the photoconversion efficiency are very similar for both kinds of photoanodes, an observation that indicates that surface properties rather than electron transport is the main efficiency-determining factor in solar cells based on ZnO nanostructured photoanodes.

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Autor(es): ALBERTO G. VEGA-POOT , MANUEL MACIAS-MONTERO , JESUS IDIGORAS , ANA BORRAS , ANGEL BARRANCO , AGUSTIN R. GONZALEZ-ELIPE , FRANCISCO I. LIZAMA-TZEC , GERKO OSKAM , JUAN A. ANTA

Campo: Energía

Disciplina: Energías alternativas y renovables

Subdisciplina: Fuentes de energía no convencionales

Número de registro: ISSN: 14394235