Role of effective carrier mass in the photocatalytic efficiency of La-doped NaTaO3

Xiang, Liu; Sohlberg, Karl

doi:10.1016/j.commatsci.2016.06.013

Cited by 23 publications

(9 citation statements)

References 25 publications

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“…15,29 It was reported, however, that the direct band gap is changed into an indirect band gap when NaTaO3 is doped with La. [41][42] The recombination of electron-hole pairs is usually much slower in the systems with an indirect band gap. The results in Figure 3b obviously oppose this tendency.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure S6, no significant change in the PL intensity was observed for Sr-NTO-SS particles by dropping methanol as a hole scavenger onto the cover glass, 6 whereas the intensity was considerably reduced by the addition of IO3 − as an electron scavenger; 46 this result is in accordance with the above proposed electron-transfer mechanism using the energy gradient in Figure 3c. Considering that most surface-trapped holes in TiO2 are captured by adsorbed alcohols within several hundred picoseconds, 47 the photogenerated holes in Sr-NTO-SS may have poor mobility due to the higher effective masses 41 or trapping in bulk. A similar interpretation was adopted to explain the fact that the STE luminescence from TiO2 at approximately 420-440 nm does not respond to exposures to ethanol solvent.…”

Section: Resultsmentioning

confidence: 99%

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Charge Carrier Dynamics in Sr-Doped NaTaO₃ Photocatalysts Revealed by Deep Ultraviolet Single-Particle Microspectroscopy

Mizutani

Karimata

et al. 2019

J. Phys. Chem. C

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Among various metal oxides, sodium tantalate (NaTaO3) is one of the best semiconductors for achieving efficient photocatalytic water splitting. However, the primary mechanism responsible for increasing the reaction rate up to an order of magnitude by specific metal doping and surface modification with co-catalysts has not been elucidated yet. In order to clarify the underlying mechanism, we explored the structure-dependent photoluminescence (PL) of pristine and Sr-doped NaTaO3 crystals at the (near) single-particle level using a time-resolved deep ultraviolet fluorescence microscope. Combined with transmission electron microscope (TEM) techniques, the PL characteristics of individual particles were directly linked to the dopant concentrations in each particle, allowing us to unravel the complex effects of Sr-doping on the charge carrier dynamics. Furthermore, we investigated the photocatalytic reduction reaction for a single Sr-doped NaTaO3 particle to gain critical information related to dopantdriven electron migration, which is a key process for efficient photocatalysis.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Charge Carrier Dynamics in Sr-Doped NaTaO₃ Photocatalysts Revealed by Deep Ultraviolet Single-Particle Microspectroscopy

Mizutani

Karimata

et al. 2019

J. Phys. Chem. C

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“…For this reason, several doping and heterojunction strategies have been proposed as an attempt to overcome this limitation by tuning the electronic band structure of the material. 4,20 Some of the most successful approaches for enhancing the photocatalytic activity of NaTaO 3 consist of La 3+ and Sr 2+ doping, 21,22 which improve charge transfer in the material 23,24 and induce surface reconstruction by creating steplike nanostructures that notably increase the surface area for water splitting reactions. 25 Despite these effects, La and Sr doping are only beneficial to the production of hydrogen under UV light, as these elements have negligible influence on the band gap.…”

Section: Introductionmentioning

confidence: 99%

Band Gap Narrowing of Bi-Doped NaTaO₃ for Photocatalytic Hydrogen Evolution under Simulated Sunlight: A Pseudocubic Phase Induced by Doping

Alves

Centurion

Ferrer

et al. 2020

ACS Appl. Energy Mater.

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NaTaO 3 is a promising material for the production of hydrogen fuel via photocatalytic water splitting, although the wide band gap prevents its application with solar light. In order to overcome this issue, bismuth doping has been proposed as a method for band gap narrowing by introducing midgap electron states. In this work, Bi-doped NaTaO 3 nanocubes were synthesized through a facile molten salt method and the photocatalysts exhibit hydrogen evolution under simulated sunlight irradiation (AM 1.5G). X-ray diffraction, Raman, and UV−vis spectra suggest that the incorporation of Bi 3+ at the Ta-site induces band gap narrowing, in addition to a structural transition, as the orthorhombic perovskite lattice becomes pseudocubic at low dopant concentrations (0.5− 4 mol %). The optimal photocatalytic activity of 3 mol % Bi-doped NaTaO 3 may be a result of the simultaneous presence of the pseudocubic lattice and the narrowed band gap of 3.6 eV, which in turn promote the absorption of ultraviolet light from the AM 1.5G irradiation source. Theoretical simulations based on density functional theory were used in conjunction with the experimental results to present in detail the additional contribution of the doped pseudocubic phase in the system. Furthermore, 3 mol % Bi-doped NaTaO 3 was loaded with Ni cocatalysts by magnetron sputtering deposition, leading to enhanced and stable H 2 production rates for more than 100 h of reaction.

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“…These alternative perovskite materials mainly emerged due to the search for lead-free and stable PV devices [7][8][9]13] and photocatalysts. [14][15][16] In 2019, a full solar cell device has been fabricated based on LaYS 3 absorbers using hightemperature growth techniques, [17] marking the first reported solar cells based on a sulfide perovskite absorber. The used high-temperature growth fabrication techniques are indicators for the stability of such materials.…”

Section: Introductionmentioning

confidence: 99%

Oxychalcogenide Perovskite Solar Cells: A Multiscale Design Approach

et al. 2019

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Herein, a multiscale approach is used to design solar cells with oxychalcogenide perovskite absorbers by combining atomistic calculations and macroscale device simulations and optimization. The method involves the computation of charge carrier recombination time as well as the carriers' scattering time where lattice dynamics and multiple carrier scattering mechanisms are taken into account. Based on microscopically calculated parameters for the oxychalcogenide perovskites, a multiproperty optimization is performed to maximize the power conversion efficiency of the full device. This approach allows identifying optimal designs of some potential oxychalcogenide perovskite solar cells comprehensively. Herein, the methodology opens opportunities to accelerate lab realization and fabrication of solar cells with oxychalcogenide perovskite absorbers. Furthermore, the presented approach combines several general methods, and it should be highly beneficial in saving time and cost of device fabrication and optimization.

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Role of effective carrier mass in the photocatalytic efficiency of La-doped NaTaO3

Cited by 23 publications

References 25 publications

Charge Carrier Dynamics in Sr-Doped NaTaO₃ Photocatalysts Revealed by Deep Ultraviolet Single-Particle Microspectroscopy

Charge Carrier Dynamics in Sr-Doped NaTaO₃ Photocatalysts Revealed by Deep Ultraviolet Single-Particle Microspectroscopy

Band Gap Narrowing of Bi-Doped NaTaO₃ for Photocatalytic Hydrogen Evolution under Simulated Sunlight: A Pseudocubic Phase Induced by Doping

Oxychalcogenide Perovskite Solar Cells: A Multiscale Design Approach

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Role of effective carrier mass in the photocatalytic efficiency of La-doped NaTaO3

Cited by 23 publications

References 25 publications

Charge Carrier Dynamics in Sr-Doped NaTaO3 Photocatalysts Revealed by Deep Ultraviolet Single-Particle Microspectroscopy

Charge Carrier Dynamics in Sr-Doped NaTaO3 Photocatalysts Revealed by Deep Ultraviolet Single-Particle Microspectroscopy

Band Gap Narrowing of Bi-Doped NaTaO3 for Photocatalytic Hydrogen Evolution under Simulated Sunlight: A Pseudocubic Phase Induced by Doping

Oxychalcogenide Perovskite Solar Cells: A Multiscale Design Approach

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Charge Carrier Dynamics in Sr-Doped NaTaO₃ Photocatalysts Revealed by Deep Ultraviolet Single-Particle Microspectroscopy

Charge Carrier Dynamics in Sr-Doped NaTaO₃ Photocatalysts Revealed by Deep Ultraviolet Single-Particle Microspectroscopy

Band Gap Narrowing of Bi-Doped NaTaO₃ for Photocatalytic Hydrogen Evolution under Simulated Sunlight: A Pseudocubic Phase Induced by Doping