Photoluminescence and surface photovoltage properties of ZnSe nanoribbons

Fan, Chao; Zhang, Qinglin; Zhu, Xiaoli; Zhuang, Xiujuan; Pan, Anlian

doi:10.1007/s11434-015-0900-2

Cited by 17 publications

(6 citation statements)

References 30 publications

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“…Additionally, the excitation of 405 nm laser leaded to a decrease and increase in the potential of Bi 2 O 2 Se and CsPbBr 3 , indicating the n-and p-type conduction of Bi 2 O 2 Se and CsPbBr 3 , respectively. [22,47] These agree well with the relative energy difference between the E F and the VBM measured by the UPS for Bi 2 O 2 Se and CsPbBr 3 . Importantly, the efficient transfer of photo-generated carriers from CsPbBr 3 to Bi 2 O 2 Se promotes the carrier accumulation in Bi 2 O 2 Se, which is expected to improve the optoelectronic performance of the devices.…”

Section: Resultssupporting

confidence: 79%

Edge assisted epitaxy of CsPbBr₃ nanoplates on Bi₂O₂Se nanosheets for enhanced photoresponse

Jiang¹,

Xu²,

Fan³

et al. 2022

Chinese Phys. B

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Bi2O2Se has been proved to be a promising candidate for electronic and optoelectronic devices due to their unique physical properties. However, it is still a great challenge to construct the heterostructures with direct epitaxy of hetero semiconductor materials on Bi2O2Se nanosheets. Here, a two-step chemical vapor deposition (CVD) route was used to directly grow the CsPbBr3 nanoplate-Bi2O2Se nanosheet heterostructures. The CsPbBr3 nanoplates were selectively grown on the Bi2O2Se nanosheet along the edges, where the dangling bonds provide the nucleation sites. The epitaxial relationships between CsPbBr3 and Bi2O2Se were determined as [200]Bi2O2Se||[110]CsPbBr3 and [110]Bi2O2Se||[200]CsPbBr3 by transmission electron microscopy characterization. The photoluminescence (PL) results reveal that the formation of heterostructures results in the remarkable PL quenching due to the type-I band arrangement at CsPbBr3/Bi2O2Se interface, which was confirmed by ultraviolet photoelectron spectroscopy (UPS) and Kelvin probe measurements, and makes the photogenerated carriers transfer from CsPbBr3 to Bi2O2Se. Importantly, the photodetectors based on the heterostructures exhibit a 4-time increase in the responsivity compared to those based on the pristine Bi2O2Se sheets, and the fast rise and decay time in microsecond. These results indicate that the direct epitaxy of the CsPbBr3 plates on the Bi2O2Se sheet may improve the optoelectronic performance of Bi2O2Se based devices.

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Section: Resultssupporting

confidence: 79%

Edge assisted epitaxy of CsPbBr₃ nanoplates on Bi₂O₂Se nanosheets for enhanced photoresponse

Jiang¹,

Xu²,

Fan³

et al. 2022

Chinese Phys. B

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“…The CsPbBr 3 precursors were synthesized by the CVD method [46][47][48], which is performed on a furnace with a 1 inchdiameter quartz tube. An alumina boat with the mixture of CsBr and PbBr 2 powders was placed at the center of the furnace, and the Silicon substrate was placed at the downstream.…”

Section: Sample Preparationmentioning

confidence: 99%

The growth kinetics of CsPbBr₃ microwires on mica: an in situ investigation

Fan¹,

Bi²,

Shu³

et al. 2020

J. Phys. D: Appl. Phys.

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1D all-inorganic perovskites microwires horizontally aligned on mica show great potential in high performance optical and optoelectronic devices. In spite of the tremendous progress in their growth and properties studies, the growth mechanism for epitaxy of perovskites microwires on mica has not been well understood. Herein, we present a home-built in situ growth monitoring system to study the growth mechanism of the CsPbBr3 microwires on mica with the physical vapor deposition (PVD). Through in situ monitoring the growth of the CsPbBr3 microwires, the detailed growth behavior can be directly investigated. It is found that the length growth rate of the microwires may be enhanced with the large undercooling (the temperature difference between the precursor and the deposition substrate), which provides the possibility to achieve the rapid growth of the wires. Additionally, CsPbBr3 microwires with smaller diameter show the higher growth rate than that with larger diameter, which is consistent with the theoretical analysis based on the adatom diffusion. By increasing the undercooling, CsPbBr3 microwires with the length up to 200 μm can be grown in 15 s, which is more efficient than the traditional vapor growth routes. Furthermore, the photoluminescence and high performance of the photodetector device based on these CsPbBr3 wire arrays indicate that the as-grown CsPbBr3 wires have the potential in the optical and optoelectronic device applications.

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“…Therefore, the introduction of a strong electron-withdrawing cyano group enables the photogenerated electron-hole pair to form directional migration, thus improving the charge separation efficiency and reducing the recombination probability of photogenerated carriers. [28] Furthermore, evidence of significant enhancement in charge separation efficiency of g-C 3 N 4 -CN was further provided through steady-state and time-resolved photoluminescence spectroscopy (PL and TR-PL). In Figure 3d, g-C 3 N 4 -CN showed the weakest PL signal, meaning that it possesses the highest charge separation efficiency.…”

Section: Resultsmentioning

confidence: 99%

Cyano‐Functionalized Graphitic Carbon Nitride with Adsorption and Photoreduction Isosite Achieving Efficient Uranium Extraction from Seawater

Hu,

Chen,

Gao

et al. 2024

Adv Funct Materials

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Photocatalytic uranium extraction from seawater is an ideal strategy to obtain uranium resources. Herein, the cyano‐functionalized graphitic carbon nitride (g‐C3N4‐CN) with an isosite structure of adsorption and photoreduction for U(VI) is successfully prepared to achieve efficient photocatalytic uranium extraction from seawater. As the key of the isosite structure, the cyano group not only dramatically promotes the separation of photogenerated charges of g‐C3N4‐CN and enriched electrons around it, but also greatly improves the adsorption capacity and selectivity for U(VI) over g‐C3N4‐CN by complexing with U(VI). Therefore, g‐C3N4‐CN exhibits efficient and stable photocatalytic U(VI) reduction performance, with a saturated uranium extraction capacity of 2644.3 mg g−1, significantly higher than most reported g‐C3N4‐based photocatalysts. Moreover, it also performs well in solar light‐driven uranium extraction from actual seawater. Briefly, this work illustrates the importance of constructing the isosite structure of adsorption and photoreduction for U(VI) in improving the photocatalytic uranium extraction performance.

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Photoluminescence and surface photovoltage properties of ZnSe nanoribbons

Cited by 17 publications

References 30 publications

Edge assisted epitaxy of CsPbBr₃ nanoplates on Bi₂O₂Se nanosheets for enhanced photoresponse

Edge assisted epitaxy of CsPbBr₃ nanoplates on Bi₂O₂Se nanosheets for enhanced photoresponse

The growth kinetics of CsPbBr₃ microwires on mica: an in situ investigation

Cyano‐Functionalized Graphitic Carbon Nitride with Adsorption and Photoreduction Isosite Achieving Efficient Uranium Extraction from Seawater

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Photoluminescence and surface photovoltage properties of ZnSe nanoribbons

Cited by 17 publications

References 30 publications

Edge assisted epitaxy of CsPbBr3 nanoplates on Bi2O2Se nanosheets for enhanced photoresponse

Edge assisted epitaxy of CsPbBr3 nanoplates on Bi2O2Se nanosheets for enhanced photoresponse

The growth kinetics of CsPbBr3 microwires on mica: an in situ investigation

Cyano‐Functionalized Graphitic Carbon Nitride with Adsorption and Photoreduction Isosite Achieving Efficient Uranium Extraction from Seawater

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Product

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About

Edge assisted epitaxy of CsPbBr₃ nanoplates on Bi₂O₂Se nanosheets for enhanced photoresponse

Edge assisted epitaxy of CsPbBr₃ nanoplates on Bi₂O₂Se nanosheets for enhanced photoresponse

The growth kinetics of CsPbBr₃ microwires on mica: an in situ investigation