Photoreflectance characterization of built-in potential in MBE-produced As-grown GaAs surface

Kanata-Kito, Takashi; Matsunaga, M.; Takakura, Hideyuki; Hamakawa, Yoshihiro; Nishino, Taneo

doi:10.1117/12.20837

Cited by 62 publications

(17 citation statements)

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“…Furthermore, the intensity of their IEF was measured via the model developed by Kanata-Kito et al . (details are given in the supplementary data online) [ 43 , 44 ]. It can be found that the IEF of Bi 8 (CrO 4 )O 11 is 8.4 times as high as that of Bi 14 CrO 24 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Large dipole moment induced efficient bismuth chromate photocatalysts for wide-spectrum driven water oxidation and complete mineralization of pollutants

Chen

et al. 2019

National Science Review

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Herein, a wide-spectrum (∼678 nm) responsive Bi8(CrO4)O11 photocatalyst with a theoretical solar spectrum efficiency of 42.0% was successfully constructed. Bi8(CrO4)O11 showed highly efficient and stable photocatalytic water oxidation activity with a notable apparent quantum efficiency of 2.87% (420 nm), superior to many reported wide-spectrum driven photocatalysts. Most remarkably, its strong oxidation ability also enables the simultaneous degradation and complete mineralization for phenol, and its excellent performance is about 23.0 and 2.9 times higher than CdS and P25-TiO2, respectively. Its high activity is ascribed to the giant internal electric field induced by its large crystal dipole, which accelerates the rapid separation of photogenerated electron–hole pairs. Briefly, the discovery of wide-spectrum bismuth chromate and the mechanism of exponentially enhanced photocatalytic performance by increasing the crystal dipole throw light on improving solar energy conversion.

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Section: Resultsmentioning

confidence: 99%

Large dipole moment induced efficient bismuth chromate photocatalysts for wide-spectrum driven water oxidation and complete mineralization of pollutants

Chen

et al. 2019

National Science Review

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“…Meanwhile, the surface photovoltage values of the TH and TH/WP-5 samples are 0.353 and 0.438 mV, respectively, as revealed in the SS-SPV spectra (Figure e). Finally, the IEF strength ( F s ) can be determined by using eq : where V s and ρ represent the surface voltage and surface charge density, respectively, and ε and ε 0 are the low-frequency dielectric constant and the permittivity of free space, respectively. With two constants of ε and ε 0 in eq , the IEF strength is generally influenced by the surface voltage and charge density.…”

Section: Resultsmentioning

confidence: 99%

Boosting Interfacial Charge Transfer with a Giant Internal Electric Field in a TiO₂ Hollow-Sphere-Based S-Scheme Heterojunction for Efficient CO₂ Photoreduction

Wang

Jiang

et al. 2022

Inorg. Chem.

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The construction of an S-scheme charge transfer pathway is considered to be a powerful way to inhibit charge recombination and maintain photogenerated carriers with high redox capacity to meet the kinetic requirements of the carbon dioxide (CO 2 ) photoreduction reaction. For an S-scheme heterojunction, an internal electric field (IEF) is regarded as the main driving force for accelerating the interfacial spatial transfer of photogenerated charges. Herein, we designed a TiO 2 hollow-sphere (TH)based S-scheme heterojunction for efficient CO 2 photoreduction, in which WO 3 nanoparticles (WP) were applied as an oxidation semiconductor to form an intimate interfacial contact with the TH. The S-scheme charge transfer mode driven by a strong IEF for the TH/WP composite was confirmed by in situ X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. As a result, abundant photogenerated electrons with strong reducing ability would take part in the CO 2 reduction reaction. The combination of surface photovoltage spectra and transient photocurrent experiments disclosed that the IEF intensity and charge separation efficiency of the fabricated TH/WP composite were nearly 16.80-and 1.42-fold higher, respectively, than those of the pure TH. Furthermore, sufficient active sites provided by the hollow-sphere structure also enhanced the kinetics of the catalytic reaction. Consequently, the optimized TH/WP composite showed a peak level of CO production of 14.20 μmol g −1 in 3 h without the addition of any sacrificial agent. This work provides insights into the kinetic studies of the S-scheme charge transfer pathway for realizing high-performance CO 2 photoreduction.

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“…The IEF intensity was estimated using the model developed by Kanata et al [36], which is mainly determined by surface charge density and surface voltage, to further validate the influence of the interfacial charge modulation on spatial charge separation.…”

Section: Resultsmentioning

confidence: 99%

“…The IEF magnitude of Hem, Hem/C 3 N 4 , and Hem/C 3 N 4 / MoO 3 was calculated using the equation developed by Kanata et al [36]:…”

Section: Pec and Electrochemical Measurementsmentioning

confidence: 99%

Manipulating interface built-in electric fields for efficient spatial charge separation in hematite-based photoanodes

Mao

Deng

et al. 2022

Sci. China Mater.

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Herein, a novel strategy of interface charge modulation for manipulating interface built-in electric fields (IEFs) and boosting spatial charge separation is introduced to alleviate charge recombination in the bulk and at the surface of hematite photoanodes. Hydrothermally grown Ti-doped hematite (Hem) nanorods are decorated with graphitic carbon nitride (g-C 3 N 4 ) species and small molybdenum oxide (MoO 3 ) clusters using a facile two-step dip-coating process. Compared with the pristine Hem, the obtained Hem/C 3 N 4 /MoO 3 exhibits increased photoelectrochemical water splitting performance with its photoanodic current density remarkably increased from 0.3 to 1.6 mA cm −2 at 1.23 V versus reversible hydrogen electrode (RHE) and incident photon-to-current conversion efficiency reaching 18.4% at 1.23 V versus RHE at 300 nm. The IEFs are introduced in the Hem/C 3 N 4 /MoO 3 heterojunction by modulating the interfacial charge property via a type II band alignment at the Hem/C 3 N 4 interface and an enhanced band bending at the surface of the photoanode, which substantially promote the spatial charge separation. By relieving the bottleneck of charge carrier transfer dynamics, this work in interfacial charge modulation provides a facile and effective strategy to boost the spatial charge separation in Hem-based photoanodes and other semiconducting devices for efficient solar energy conversion.

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Photoreflectance characterization of built-in potential in MBE-produced As-grown GaAs surface

Cited by 62 publications

References 0 publications

Large dipole moment induced efficient bismuth chromate photocatalysts for wide-spectrum driven water oxidation and complete mineralization of pollutants

Large dipole moment induced efficient bismuth chromate photocatalysts for wide-spectrum driven water oxidation and complete mineralization of pollutants

Boosting Interfacial Charge Transfer with a Giant Internal Electric Field in a TiO₂ Hollow-Sphere-Based S-Scheme Heterojunction for Efficient CO₂ Photoreduction

Manipulating interface built-in electric fields for efficient spatial charge separation in hematite-based photoanodes

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Photoreflectance characterization of built-in potential in MBE-produced As-grown GaAs surface

Cited by 62 publications

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Large dipole moment induced efficient bismuth chromate photocatalysts for wide-spectrum driven water oxidation and complete mineralization of pollutants

Large dipole moment induced efficient bismuth chromate photocatalysts for wide-spectrum driven water oxidation and complete mineralization of pollutants

Boosting Interfacial Charge Transfer with a Giant Internal Electric Field in a TiO2 Hollow-Sphere-Based S-Scheme Heterojunction for Efficient CO2 Photoreduction

Manipulating interface built-in electric fields for efficient spatial charge separation in hematite-based photoanodes

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Boosting Interfacial Charge Transfer with a Giant Internal Electric Field in a TiO₂ Hollow-Sphere-Based S-Scheme Heterojunction for Efficient CO₂ Photoreduction