Fabrication of [email protected] Core/Shell Nanoparticles Decorated TiO2 Hollow Structure for Efficient Light-Harvesting in Dye-Sensitized Solar Cells

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School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanakgu, Seoul 151-742, Korea
Cite this: ACS Appl. Mater. Interfaces 2015, 7, 3, 2055–2063
Publication Date (Web):January 6, 2015
Copyright © 2015 American Chemical Society
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Improving the light-harvesting properties of photoanodes is promising way to enhance the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). We synthesized [email protected] core/shell nanoparticles decorated TiO2 hollow nanoparticles ([email protected]/TiO2 HNPs) via sol–gel reaction and chemical deposition. The [email protected]/TiO2 HNPs exhibited multifunctions from [email protected] core/shell NPs ([email protected] CSNPs) and TiO2 hollow nanoparticles (TiO2 HNPs). These [email protected] CSNPs exhibited strong and broadened localized surface plasmon resonance (LSPR), together with a large specific surface area of 129 m2 g–1, light scattering effect, and facile oxidation–reduction reaction of electrolyte from TiO2 HNPs, which resulted in enhancement of the light harvesting. The optimum PCE of η = 9.7% was achieved for the DSSCs using photoanode materials based on TiO2 HNPs containing [email protected]/TiO2 HNPs (0.2 wt % [email protected] CSNPs with respect to TiO2 HNPs), which outperformed by 24% enhancement that of conventional photoanodes formed using P25 (η = 7.8%).

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TEM images of Au/TiO2 HNPs and Ag/TiO2 HNPs, EDS spectra of [email protected]/TiO2 HNPs, TEM images of silica coated [email protected]/TiO2 HNPs, UV–vis spectra of [email protected]/TiO2 HNPs with and without silica shell, absorption spectra of dye desorption from photo anode, current–voltage curve, and table for additional photovoltaic parameters. This material is available free of charge via the Internet at

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