Enhanced Photovoltaic Properties of Nb2O5‑Coated TiO2 3D Ordered Porous Electrodes in Dye-Sensitized Solar Cells

This paper describes the use of Nb2O5-coated TiO2 3D ordered porous electrodes in dye-sensitized solar cells. We employed bilayer inverse opal structures as a backbone of 3D porous structures, and the number of Nb2O5 coatings was controlled, determining the concentration of Nb2O5 coating. XPS measur...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2012-11, Vol.4 (11), p.5821-5825
Main Authors: Kim, Hye-Na, Moon, Jun Hyuk
Format: Article
Language:English
Subjects:
Coloring Agents - chemistry
Coloring Agents - radiation effects
Crystallization - methods
Electric Power Supplies
Electrodes
Equipment Design
Equipment Failure Analysis
Light
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanotechnology - instrumentation
Niobium - chemistry
Oxides - chemistry
Particle Size
Porosity
Solar Energy
Titanium - chemistry
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Summary:This paper describes the use of Nb2O5-coated TiO2 3D ordered porous electrodes in dye-sensitized solar cells. We employed bilayer inverse opal structures as a backbone of 3D porous structures, and the number of Nb2O5 coatings was controlled, determining the concentration of Nb2O5 coating. XPS measurements confirmed the formation of Nb2O5. The uniformity of the Nb2O5 coating was characterized by elemental mapping using SEM and TEM measurements. Photovoltaic measurement on dye-sensitized solar cells (DSSCs) that incorporated Nb2O5/TiO2 inverse opal electrodes yielded a maximum efficiency of 7.23% for a 3.3 wt % Nb2O5 coating on a TiO2 IO structure. The Nb2O5 significantly increased the short-circuit current density (J SC). Electrochemical impedance spectroscopy was used to measure the J SC, revealing an enhanced electron injection upon deposition of the Nb2O5 coating.
ISSN:1944-8244
1944-8252
DOI:10.1021/am3014554