Oxygen partial pressure dependent UV photodetector performance of WO3 sputtered thin films

Yadav, P.V. Karthik; Reddy, Y. Ashok Kumar; Ajitha, B.; Reddy, Vasudeva Reddy Minnam

doi:10.1016/j.jallcom.2019.152565

Cited by 66 publications

(21 citation statements)

References 36 publications

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“…When comparing the XPS O1 spectra of the initial nanotubes and the WC1-x/MWCNT composite shown in Figure 9b, the additional intense O peak (530.4 eV) is observed. The energy position of this peak is in good agreement with the main peak in the WO3 spectra [85,86]. This suggests that, in addition to the WC1-x bulk layer, a tungsten oxide layer forms on the composite surface.…”

Section: Xps Research Of the Nanocomposites And Initial Mwcntssupporting

confidence: 74%

Studies of Buried Layers and Interfaces of Tungsten Carbide Coatings on the MWCNT Surface by XPS and NEXAFS Spectroscopy

et al. 2020

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Currently, X-ray photoelectron spectroscopy (XPS) is widely used to characterize the nanostructured material surface. The ability to determine the atom distribution and chemical state with depth without the sample destruction is important for studying the internal structure of the coating layer several nanometers thick, and makes XPS the preferable tool for the non-destructive testing of nanostructured systems. In this work, ultra-soft X-ray spectroscopy methods are used to study hidden layers and interfaces of pyrolytic tungsten carbide nanoscale coatings on the multi-walled carbon nanotube (MWCNT) surfaces. XPS measurements were performed using laboratory spectrometers with sample charge compensation, and Near Edge X-ray Absorption Fine Structure (NEXAFS) studies using the Russian–German dipole beamline (RGBL) synchrotron radiation at BESSY-II. The studied samples were tested by scanning and transmission electron microscopy, X-ray diffractometry, Raman scattering and NEXAFS spectroscopy. It was shown that the interface between MWCNT and the pyrolytic coating of tungsten carbide has a three-layer structure: (i) an interface layer consisting of the outer graphene layer carbon atoms, forming bonds with oxygen atoms from the oxides adsorbed on the MWCNT surface, and tungsten atoms from the coating layer; (ii) a non-stoichiometric tungsten carbide WC1-x nanoscale particles layer; (iii) a 3.3 nm thick non-stoichiometric tungsten oxide WO3-x layer on the WC1-x/MWCNT nanocomposite outer surface, formed in air. The tungsten carbide nanosized particle’s adhesion to the nanotube outer surface is ensured by the formation of a chemical bond between the carbon atoms from the MWCNT upper layer and the tungsten atoms from the coating layer.

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Section: Xps Research Of the Nanocomposites And Initial Mwcntssupporting

confidence: 74%

Studies of Buried Layers and Interfaces of Tungsten Carbide Coatings on the MWCNT Surface by XPS and NEXAFS Spectroscopy

et al. 2020

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“…Thanks to heterogeneous photocatalysis studies, it was discovered that many of the metal oxide materials have their principal optical and electronic transitions in the near-UV region of the electromagnetic spectrum (E λ = 2.5-5 eV). For example, ZnO, TiO 2 and SnO 2 exhibit a bandgap of 3.5-3.7 eV [86], 3.0-3.2 eV [87], and 3.6 eV [88], respectively. The adsorbed light can affect the electrical properties of semiconducting materials by creating free carriers by either intrinsic or extrinsic optical adsorption [89].…”

Section: Surface Photoactivationmentioning

confidence: 99%

Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

Galstyan

Kaur

Zappa

et al. 2020

Sensors

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In this paper, we present the investigations on metal oxide-based gas sensors considering the works performed at SENSOR lab, University of Brescia (Italy). We reported the developments in synthesis techniques for the preparation of doped and functionalized low-dimensional metal oxide materials. Furthermore, we discussed our achievements in the fabrication of heterostructures with unique functional features. In particular, we focused on the strategies to improve the sensing performance of metal oxides at relatively low operating temperatures. We presented our studies on surface photoactivation of sensing structures considering the application of biocompatible materials in the architecture of the functional devices as well.

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“…These materials have been used in light-emitting diodes, sensors, transistors, lasers, displays, photodetectors, highpowered devices, solar cells, memory and so on [1][2][3][4][5][6][7][8]. Given their wide bandgap, inorganic oxide-based semiconductor materials, such as In2O3 (3.7 eV), Ga2O3 (4.9 eV), ZnO (3.37 eV), NiO (3.9 eV) and WO3 (2.8 eV) have been utilised for optoelectronic devices [9][10][11][12]. Among these materials, ZnO is a popular inorganic substance owing to its excellent characteristics, such as high exciton binding energy (60 meV), high stability of thermal and chemical, high mechanical strength, simple processing, nontoxicity, low cost and various nanostructures (e.g.…”

Section: Introductionmentioning

confidence: 99%

Pd Nanoparticle Adsorption ZnO Nanorods for Enhancing Photodetector UV-Sensing Performance

Young

Liu

2021

IEEE J. Electron Devices Soc.

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Ultraviolet (UV) detection is an important index, as UV rays can cause skin diseases in humans. To enhance the performance of UV photodetectors, we fabricated palladium nanoparticles-(Pd NPs) modified ZnO nanorods. The surface morphology is observed by using transmission electron microscopy and transmission electron microscopy. The crystal structure is analysed by using X-ray diffraction. The optical property is investigated by using photoluminescence spectra. The Idark of the ZnO and Pd/ZnO samples was 5.05 × 10 -8 and 2.24 × 10 -9 A when a 1 V bias was applied. On the other hand, the Iphoto of the ZnO and Pd/ZnO samples was 2.56 × 10 -6 and 4.38 × 10 -6 A when the sample is illuminated UV light (365 nm). The current ratio of Iphoto / Idark for the ZnO and Pd/ZnO samples was 50.8 and 1960, respectively. The enhanced performance of the Pd NPs can produce a strong electric field after light is absorbed via the localised surface plasmon resonance effect.

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Oxygen partial pressure dependent UV photodetector performance of WO3 sputtered thin films

Cited by 66 publications

References 36 publications

Studies of Buried Layers and Interfaces of Tungsten Carbide Coatings on the MWCNT Surface by XPS and NEXAFS Spectroscopy

Studies of Buried Layers and Interfaces of Tungsten Carbide Coatings on the MWCNT Surface by XPS and NEXAFS Spectroscopy

Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

Pd Nanoparticle Adsorption ZnO Nanorods for Enhancing Photodetector UV-Sensing Performance

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