Publicación

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

Título del artículo: ZNO/ZNO CORE-SHELL NANOWIRE ARRAY ELECTRODES: BLOCKING OF RECOMBINATION AND IMPRESSIVE ENHANCEMENT OF PHOTOVOLTAGE IN DYE-SENSITIZED SOLAR CELLS

Registrado por: JOURNAL OF PHYSICAL CHEMISTRY C

Año de publicación: 2013

Resumen: multistep wet-chemistry route was developed, by combining electrodeposition, colloidal synthesis and spin coating, to obtain arrays of ZnO nanowires (NWs) coated by a ZnO nanocrystalline layer (i.e., ZnO/ZnO core?shell NWs). They were integrated as
anodes in dye-sensitized solar cells. With the use of an iodide-based electrolyte, photovoltages as impressive as 870 mV were obtained with an enhancement of more than 250 mV with respect to devices based on bare NWs. A comprehensive device characterization study by means of impedance spectroscopy (EIS) and intensity-modulated photovoltage spectroscopy (IMVS) reveals a significant blockage of recombination upon NW shell deposition. To study the generality of this multistep method, electrodes of core?shell nanostructures based on commercial ZnO nanoparticles were also prepared. A decrease of recombination rate is also detected, although it is much more moderate than the observed for nanowire-based electrodes. The present ZnO synthetic approach allows obtaining nanowirebased dye-sensitized solar cells which exhibit longer electron lifetimes than nanocrystalline analogues. This finding implies a significant improvement of Photovoltage with respect to the state of the art ZnO-based dye-sensitized solar cells.

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Autor(es): ELENA GUILLEN , ENEKO AZACETA , ALBERTO VEGA-POOT , JESUS IDIGORAS , JON ECHEBERRIA , JUAN A. ANTA , RAMON TENA-ZAERA

Campo: Energía

Disciplina: Energías alternativas y renovables

Subdisciplina: Fuentes de energía no convencionales

Número de registro: ISSN: 19327447