Strong Visible‐Light Absorption and Hot‐Carrier Injection in TiO<sub>2</sub>/SrRuO<sub>3</sub> Heterostructures

Lee, Sungki; Apgar, Brent A.; Martin, Lane W.

doi:10.1002/aenm.201201116

Cited by 37 publications

(40 citation statements)

References 43 publications

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“…This is further confirmed by the measured extremely low carrier mobility in films grown at O 2 deposition pressure below 50 mTorr, as the non-equilibrium charge carriers are usually trapped by the defects24. The carrier concentrations measured for the films grown at O 2 deposition pressure above 50 mTorr are in agreement with the previously observed values2526.…”

Section: Discussionsupporting

confidence: 89%

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Optimizing Strontium Ruthenate Thin Films for Near-Infrared Plasmonic Applications

Braic

Vasilantonakis

Zou

et al. 2015

Sci Rep

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Several new plasmonic materials have recently been introduced in order to achieve better temperature stability than conventional plasmonic metals and control field localization with a choice of plasma frequencies in a wide spectral range. Here, epitaxial SrRuO3 thin films with low surface roughness fabricated by pulsed laser deposition are studied. The influence of the oxygen deposition pressure (20–300 mTorr) on the charge carrier dynamics and optical constants of the thin films in the near-infrared spectral range is elucidated. It is demonstrated that SrRuO3 thin films exhibit plasmonic behavior of the thin films in the near-infrared spectral range with the plasma frequency in 3.16–3.86 eV range and epsilon-near-zero wavelength in 1.11–1.47 μm range that could be controlled by the deposition conditions. The possible applications of these films range from the heat-generating nanostructures in the near-infrared spectral range, to metamaterial-based ideal absorbers and epsilon-near-zero components, where the interplay between real and imaginary parts of the permittivity in a given spectral range is needed for optimizing the spectral performance.

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Section: Discussionsupporting

confidence: 89%

“…SRO benefits from the increased loss while maintaining the ENZ properties in the applications where the balance between the field penetration and dissipation is important, such as metamaterial-based absorbers, heat-generation in the near-IR and plasmonic hot-electron sources26.…”

Section: Discussionmentioning

confidence: 99%

Optimizing Strontium Ruthenate Thin Films for Near-Infrared Plasmonic Applications

Braic

Vasilantonakis

Zou

et al. 2015

Sci Rep

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“…5,6 Hence, various kinds of efforts have been made to extend the cut-off wavelength of wide band catalysts, including doping with the small size atomic elements (C, N, F, and S) or designing heterostructures. [15][16][17][18] These nanoclusters can not only competently suppress the recombination of electron-hole pairs, but also act as a co-catalyst for efficient oxygen reduction to consume the photoinduced electrons. [7][8][9][10][11] Compared with doping with heterogeneous elements, self-doped photocatalysts exhibit better visible-light photocatalytic activity owing to their more homogeneous texture.…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis and Nb₄N₅ surface modification of Nb⁴⁺ self-doped KNbO₃ nanorods for enhanced visible-light-driven hydrogen production

Wang

Cui

et al. 2015

Phys. Chem. Chem. Phys.

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Herein, rhombohedral self-doped KNbO3 (S-KN) nanorods were fabricated via a one pot, solvothermal method without using any surfactant. The presence of Nb(4+) in S-KN greatly narrows its band gap and thus extends its photoresponse from UV to the visible light region. Moreover, S-KN/Nb4N5 nanorod heterostructures were obtained by nitriding S-KN nanorods for different times, which exhibited significantly enhanced photocatalytic activity for hydrogen production under visible light irradiation. The junction formed between S-KN and Nb4N5 and the Nb(4+) self-doping of KN are supposed to be responsible for the enhanced photocatalytic activity of S-KN/Nb4N5. This study also paves the way for the synthesis of other similar photocatalysts.

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“…20 PEC experiments were performed using a setup and measurement process that have been described previously. 21,22 Photocatalytic activities of the samples were examined by measuring the degradation rate of methylene blue solution, which is an effective method to evaluate the visible light absorption ability of the thin film material. Typically, the STO control sample and 10% doped SLTCO with 5 nm STO protection layer were measured under an AM1.5G spectrum light filtered by a k ¼ 444 nm long-pass filter for 12 h. The filter cuts off light with wavelength shorter than 444 nm (տ2.8 eV), thus eliminating effects of the primary O 2p to Ti 3d absorption in STO.…”

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confidence: 99%

Visible light carrier generation in co-doped epitaxial titanate films

Comès

Smolin

Kaspar

et al. 2015

Applied Physics Letters

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Perovskite titanates such as SrTiO$_{3}$ (STO) exhibit a wide range of important functional properties, including high electron mobility, ferroelectricity, and excellent photocatalytic performance. The wide optical band gap of titanates limits their use in these applications, however, making them ill-suited for integration into solar energy harvesting technologies. Our recent work has shown that by doping STO with equal concentrations of La and Cr we can enhance visible light absorption in epitaxial thin films while avoiding any compensating defects. In this work, we explore the optical properties of photoexcited carriers in these films. Using spectroscopic ellipsometry, we show that the Cr$^{3+}$ dopants, which produce electronic states immediately above the top of the O 2p valence band in STO reduce the direct band gap of the material from 3.75 eV to between 2.4 and 2.7 eV depending on doping levels. Transient reflectance spectroscopy measurements are in agreement with the observations from ellipsometry and confirm that optically generated carriers are present for longer than 2 ns. Finally, through photoelectrochemical methylene blue degradation measurements, we show that these co-doped films exhibit enhanced visible light photocatalysis when compared to pure STO.Comment: 19 pages including supplement, 8 figures (3 main, 5 supplement

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Strong Visible‐Light Absorption and Hot‐Carrier Injection in TiO₂/SrRuO₃ Heterostructures

Cited by 37 publications

References 43 publications

Optimizing Strontium Ruthenate Thin Films for Near-Infrared Plasmonic Applications

Optimizing Strontium Ruthenate Thin Films for Near-Infrared Plasmonic Applications

One-pot synthesis and Nb₄N₅ surface modification of Nb⁴⁺ self-doped KNbO₃ nanorods for enhanced visible-light-driven hydrogen production

Visible light carrier generation in co-doped epitaxial titanate films

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Strong Visible‐Light Absorption and Hot‐Carrier Injection in TiO2/SrRuO3 Heterostructures

Cited by 37 publications

References 43 publications

Optimizing Strontium Ruthenate Thin Films for Near-Infrared Plasmonic Applications

Optimizing Strontium Ruthenate Thin Films for Near-Infrared Plasmonic Applications

One-pot synthesis and Nb4N5 surface modification of Nb4+ self-doped KNbO3 nanorods for enhanced visible-light-driven hydrogen production

Visible light carrier generation in co-doped epitaxial titanate films

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Strong Visible‐Light Absorption and Hot‐Carrier Injection in TiO₂/SrRuO₃ Heterostructures

One-pot synthesis and Nb₄N₅ surface modification of Nb⁴⁺ self-doped KNbO₃ nanorods for enhanced visible-light-driven hydrogen production