Pyramidal Metal-dielectric hybrid-structure geometry with an asymmetric TiO2 layer for broadband light absorption and photocatalytic applications

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In this study, a pyramidal metal-dielectric hybrid-structure geometry with high broadband light absorption was prepared and applied as a photoelectrode for solar water oxidation. TiO2 was obliquely deposited on the pyramidal Au film, leading to asymmetrically thick pyramids. With the decoration of Au nanoparticles, the light absorption in the entire UV-visible region significantly increased to > 90%, which was examined by three-dimensional finite-difference time-domain simulations and confirmed by confocal spectral mapping techniques. By the introduction of Ti as the insertion layer, the alignment of bands at the TiO2/Au film interface was tuned, thereby promoting the separation of photogenerated carriers via the efficient transport of electrons to the Au film. This transport led to a remarkable enhancement in the photocurrent density (similar to 0.16 mA/cm(2)) by 3.4 times compared to that observed for a flat TiO2 layer.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2018-11
Language
English
Article Type
Article
Keywords

DIFFUSION

Citation

NANO ENERGY, v.53, pp.468 - 474

ISSN
2211-2855
DOI
10.1016/j.nanoen.2018.08.074
URI
http://hdl.handle.net/10203/246893
Appears in Collection
MS-Journal Papers(저널논문)
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