Analysis of ultraviolet photo-response of ZnO nanostructures prepared by electrodeposition and atomic layer deposition

Makhlouf, H.; Karam, Chantal; Lamouchi, A.; Tingry, Sophie; Miele, Philippe; Habchi, Roland; Chtourou, R.; Bechelany, Mikhaël

doi:10.1016/j.apsusc.2018.02.289

Cited by 20 publications

(12 citation statements)

References 42 publications

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“…This high responsivity value (126 A/W) also demonstrates the fact that most of the photo-generated e-h pairs were collected at the reception terminals, which is highly expected of a good UV sensor. Without even using sophisticated external techniques, including the use of surfactants, antireflection coatings, Schottky barrier stimulation, and metal nanoparticle decoration, the presented results for HZFR are better than those in previously published reports [35][36][37][38], which is of great importance and success in the research and development on this important topic.…”

Section: Proposed Uv Sensor Mechanism For Hzfrcontrasting

confidence: 55%

Hybrid ZnO Flowers-Rods Nanostructure for Improved Photodetection Compared to Standalone Flowers and Rods

et al. 2021

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Different Zinc Oxide (ZnO) morphologies have been used to improve photodetector efficiencies for optoelectronic applications. Herein, we present the very novel hybrid ZnO flower-rod (HZFR) morphology, to improve photodetector response and efficiency when compared to the prevalently used ZnO nanorods (NRs) and ZnO nanoflowers (NFs). The HZFR was fabricated via sol-gel microwave-assisted hydrothermal methods. HZFR achieves the benefits of both NFs, by trapping a greater amount of UV light for the generation of e-h pairs, and NRs, by effectively transporting the generated e-h pairs to the channel. The fabricated photosensors were characterized with scanning electron microscopy, X-ray diffraction, photoluminescence, and a Keithley 4200A-SCS parameter analyzer for their morphology, structural characteristics, optical performance, and electrical characteristics, respectively. The transient current response, current-voltage characteristics, and responsivity measurements were set as a benchmark of success to compare the sensor response of the three different morphologies. It was found that the novel HZFR showed the best UV sensor performance with the fastest response time (~7 s), the highest on-off ratio (52), and the best responsivity (126 A/W) when compared to the NRs and NFs. Hence, it was inferred that the HZFR morphology would be a great addition to the ZnO family for photodetector applications.

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Section: Proposed Uv Sensor Mechanism For Hzfrcontrasting

confidence: 55%

Hybrid ZnO Flowers-Rods Nanostructure for Improved Photodetection Compared to Standalone Flowers and Rods

et al. 2021

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“…The graphs in Figure 10 show the R of the samples as a function of wavelength. The best R was exhibited by S3 operating the device on a mere 2 V, which is better than the recently published reports [40][41][42]. Herein, S3 shows the best R of 104 (±1) A/W compared to 44 (±2) A/W and 16 (±4) A/W in S1 and S2, respectively.…”

Section: Quantum Efficiency Responsivity and Photoconductive Gainmentioning

confidence: 48%

Intrinsic Control in Defects Density for Improved ZnO Nanorod-Based UV Sensor Performance

et al. 2020

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Hitherto, most research has primarily focused on improving the UV sensor efficiency via surface treatments and by stimulating the ZnO nanorod (ZNR) surface Schottky barriers. However, to the best of our knowledge, no study has yet probed the intrinsic crystal defect generation and its effects on UV sensor efficiency. In this study, we undertake this task by fabricating an intrinsic defect-prone hydrothermally grown ZNRs (S1), Ga-doped ZNRs (S2), and defect-free microwave-assisted grown ZNRs (S3). The defect states were recognized by studying X-ray diffraction and photoluminescence characteristics. The large number of crystal defects in S1 and S2 had two pronged disadvantages. (1) Most of the UV light was absorbed by the defect traps and the e–h pair generation was compromised. (2) Mobility was directly affected by the carrier–carrier scattering and phonon scattering processes. Hence, the overall UV sensor efficiency was compromised based on the defect-induced mobility-response model. Considering the facts, defect-free S3 exhibited the best UV sensor performance with the highest on/off ratio, the least impulse response time, the highest recombination time, and highest gain-induced responsivity to 368 nm UV light, which was desired of an efficient passive metal oxide-based UV sensor. Our results were compared with the recently published results.

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“…As the absorbance of U-ZnO NW layers was high enough (>90% for all numbers of layers) to neglect its negative impact on efficiency, the electron transportation inadequacy remains the most probable reason for this low efficiency. The highly activated surface area provided by the 3D multilayers of U-ZnO NWs could be an interesting architecture for gas-and UV-sensing devices 38 because the physical interactions are mostly manifested on the surface.…”

Section: Performance Of the Hybrid Nanoparticle Core-shell Structure As A Solar Cellmentioning

confidence: 99%

Design of Multilayers of Urchin-like ZnO Nanowires Coated with TiO₂Nanostructures for Dye-Sensitized Solar Cells

Karam

Habchi

Tingry

et al. 2018

ACS Appl. Nano Mater.

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In dye-sensitized solar cells, the photovoltaic efficiency of nanowires (NW) is still limited by their surface area and loss of light absorption compared with nanoparticle (NP) architectures. To overcome this limitation, the light harvesting efficiencies must be improved by increasing the total NW array surface area, without increasing too much the traveled distance of electrons.Here, we describe the design of a 3D architecture based on polystyrene spheres (PS) coated with ordered multilayers of urchin-like ZnO NWs (U-ZnO NWs) to be used as a high surface area nanostructure photoanode for dye-sensitized solar cells. Two to four layers of U-ZnO NWs were synthesized by using PS of 1 and 5 µm in diameter. The ordered layers of U-ZnO NWs were then coated with a thin layer of TiO2 by atomic layer deposition, and topped with a ~ 9-14 µm thick layer of anatase TiO2 NPs. We found that assembling organized layers of U-ZnO NWs significantly increased the surface area and provided better photon absorption. Moreover, coating the U-ZnO NWs with a thin TiO2 layer decreased the charge recombination and consequently enhanced the photovoltaic efficiency.

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Analysis of ultraviolet photo-response of ZnO nanostructures prepared by electrodeposition and atomic layer deposition

Cited by 20 publications

References 42 publications

Hybrid ZnO Flowers-Rods Nanostructure for Improved Photodetection Compared to Standalone Flowers and Rods

Hybrid ZnO Flowers-Rods Nanostructure for Improved Photodetection Compared to Standalone Flowers and Rods

Intrinsic Control in Defects Density for Improved ZnO Nanorod-Based UV Sensor Performance

Design of Multilayers of Urchin-like ZnO Nanowires Coated with TiO₂Nanostructures for Dye-Sensitized Solar Cells

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Analysis of ultraviolet photo-response of ZnO nanostructures prepared by electrodeposition and atomic layer deposition

Cited by 20 publications

References 42 publications

Hybrid ZnO Flowers-Rods Nanostructure for Improved Photodetection Compared to Standalone Flowers and Rods

Hybrid ZnO Flowers-Rods Nanostructure for Improved Photodetection Compared to Standalone Flowers and Rods

Intrinsic Control in Defects Density for Improved ZnO Nanorod-Based UV Sensor Performance

Design of Multilayers of Urchin-like ZnO Nanowires Coated with TiO2Nanostructures for Dye-Sensitized Solar Cells

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Product

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About

Design of Multilayers of Urchin-like ZnO Nanowires Coated with TiO₂Nanostructures for Dye-Sensitized Solar Cells