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Electron transport and visible light absorption in a plasmonic photocatalyst based on strontium niobate

by Xu, R. , Ariando , Asta, M. , Venkatesan, T , Hong, J. , Nelson, C. T. , Rusydi, A. , Zhao, Y. L. , Chen, W. , Yan, B. X. , Huang, Z. , Chen, J. Q. , Breese, M. B. H. , Xiang, D. , Wan, D. Y. , Cai, Y. , Minor, A. M. , Zheng, H. , Sherburne, M. , Asmara, T. C. , Yin, S. M. , Motapothula, M. R. , Chi, X. , Xu, Q-H

in 132/122 / 639/301/119/544 / 639/301/299/890 / Absorption / Catalysis / Electrons / Engineering / Humanities and Social Sciences / Hydrogen / Hydrogen production / INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY / Irradiation / Light / Materials science / multidisciplinary / Photocatalysis / Science / Science & Technology - Other Topics / Science (multidisciplinary) / Strontium / Thin films

2017

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Electron transport and visible light absorption in a plasmonic photocatalyst based on strontium niobate

2017

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Electron transport and visible light absorption in a plasmonic photocatalyst based on strontium niobate

2017

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Journal Article

Electron transport and visible light absorption in a plasmonic photocatalyst based on strontium niobate

Xu, R.,

Ariando,

Asta, M.,

Venkatesan, T,

Hong, J.,

Nelson, C. T.,

Rusydi, A.,

Zhao, Y. L.,

Chen, W.,

Yan, B. X.,

Huang, Z.,

Chen, J. Q.,

Breese, M. B. H.,

Xiang, D.,

Wan, D. Y.,

Cai, Y.,

Minor, A. M.,

Zheng, H.,

Sherburne, M.,

Asmara, T. C.,

Yin, S. M.,

Motapothula, M. R.,

Chi, X.,

Xu, Q-H

2017

Overview

Semiconductor compounds are widely used for photocatalytic hydrogen production applications, where photogenerated electron–hole pairs are exploited to induce catalysis. Recently, powders of a metallic oxide (Sr 1− x NbO 3 , 0.03< x <0.20) were reported to show competitive photocatalytic efficiencies under visible light, which was attributed to interband absorption. This discovery expanded the range of materials available for optimized performance as photocatalysts. Here we study epitaxial thin films of SrNbO 3+ δ and find that their bandgaps are ∼4.1 eV. Surprisingly, the carrier density of the conducting phase exceeds 10 22 cm −3 and the carrier mobility is only 2.47 cm 2 V −1 s −1 . Contrary to earlier reports, the visible light absorption at 1.8 eV (∼688 nm) is due to the plasmon resonance, arising from the large carrier density. We propose that the hot electron and hole carriers excited via Landau damping (during the plasmon decay) are responsible for the photocatalytic property of this material under visible light irradiation. Metallic oxide SrNbO 3 has been identified as an efficient hydrogen evolution photocatalyst. Here, Venkatesan and co-workers show that its visible light absorption stems from plasmon resonance, thanks to its large carrier density (despite a large 4.1 eV bandgap), as opposed to from an interband transition.

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