Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 42, Pages 11203-11207Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201405598
Keywords
kinetics; nanomaterials; photocatalysis; solar energy conversion; surface plasmon resonance
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Funding
- Global Frontier R&D Program of the Center for Multiscale Energy System of the National Research Foundation - Ministry of Science, ICT Future, Korea [NRF-2011-0031571]
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Great strides have been made in enhancing solar energy conversion by utilizing plasmonic nanostructures in semiconductors. However, current generation with plasmonic nanostructures is still somewhat inefficient owing to the ultrafast decay of plasmon-induced hot electrons. It is now shown that the ultrafast decay of hot electrons across Au nanoparticles can be significantly reduced by strong coupling with CdS quantum dots and by a Schottky junction with perovskite SrTiO3 nanoparticles. The designed plasmonic nanostructure with three distinct components enables a hot-electron-assisted energy cascade for electron transfer, CdSAuSrTiO3, as demonstrated by steady-state and time-resolved photoluminescence spectroscopy. Consequently, hot-electron transfer enabled the efficient production of H-2 from water as well as significant electron harvesting under irradiation with visible light of various wavelengths. These findings provide a new approach for overcoming the low efficiency that is typically associated with plasmonic nanostructures.
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