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Preparation of nanoporous TiO2 electrodes using different mesostructured silica templates and improvement of the photovoltaic properties of DSSCs

By K.J. Hwang, D.W. Cho, J.W. Lee and C. Im

Abstract

Nanoporous TiO2 (NP-TiO2) was synthesized using different mesostructured silica templates such as SBA-15, KIT-6, and MSU-H, which have highly ordered pore or well-connected inner-network structures. NP-TiO2 has a large surface area and a dye-adsorption capability 1.5 times greater than that of nanocrystalline TiO2 (NC-TiO2). We have investigated dye-sensitized solar cells (DSSCs) with bilayer TiO2 electrodes, which were prepared by applying a coating of NP-TiO2 onto an NC-TiO2 film. The photocurrent (J(sc)) and fill factor (FF) for the DSSC with the bilayer TiO2 electrode were greatly improved. The solar energy conversion efficiency (eta(eff)) also increased over 15% compared with a DSSC with a monolayer NC-TiO2 electrode. For the DSSC with the bilayer TiO2 electrode, the charge recombination and dye-regeneration processes, which were studied by transient absorption spectroscopy, were slower and faster, respectively, than those of the DSSC with an NC-TiO2 electrode

Year: 2012
DOI identifier: 10.1039/c2nj40547d
OAI identifier: oai:fraunhofer.de:N-223403
Provided by: Fraunhofer-ePrints
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