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- 2019
- solar cell
- thin film
- sputtering
- Tungsten di sulfide (WS2)
- Optoelectronic Information Materials and Devices
- Universiti Kebangsaan Malaysia
- German Malaysian Institute
- Universiti Tenaga Nasional
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[IEEE 48th European Solid-State Device Research Conference (ESSDERC 2018) - Dresden (2018.9.3-2018.9.6)] 2018 48th European Solid-State Device Research Conference (ESSDERC) - Electric Double Layer Esaki Tunnel Junction in a 40-nm-Length, WSe2 Channel Grown by Molecular Beam Epitaxy on Al203
摘要： An electric-double-layer (EDL) Esaki junction is demonstrated for the first time in a molecular beam epitaxy-grown WSe2 thin-film field-effect transistor (FET). By carefully engineering the strength and spatial extent of the electron-cation and hole-anion EDLs at the WSe2/solid polymer electrolyte polyethylene oxide: cesium perchlorate (PEO:CsClO4) interface, degenerate and abrupt doping profiles are obtained, which are key to enable interband tunneling operations. Gate-tunable negative differential resistance (NDR) is measured at temperatures up to 140 K, with a maximum peak-to-valley current ratio (PVCR) of 3.5 at 110 K, in a 40 nm-long channel device.
关键词： tunnel diode,Esaki tunneling,electric double layer,tungsten diselenide,cesium perchlorate,polyethylene oxide
更新于2025-09-04 15:30:14
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Effect of doping Fe/Cu/Ti on WO <sub/>3</sub> on furfural degradation
摘要： This research improved tungsten oxide catalysts to increase efficiency in photocatalytic degradation of furfural under visible light. The aim of this research was to compare the efficiency of modified tungsten oxide with undoped and commercial tungsten oxide. Tungsten oxide nanoparticles were doped with 3 single metals, which were Fe/Cu/Ti at 1%wt, 2%wt, and 3%wt, synthesized by flame spray pyrolysis technique (FSP) and then characterization by X-Ray Diffraction (XRD), N2 adsorption/desorption (BET surface area analysis), UV-Vis Spectroscopy (UV-Vis). Photocatalytic degradation experiments using doped WO3 were carried out with 5 ppm initial concentration of furfural solution using 0.6 M catalyst concentration under visible light. From the results, FSP-synthesized WO3 has better efficiency in furfural degradation than the commercial WO3. All catalysts have mesoporous structure because an average pore size is in the range of 6-10 nm. Among all synthesized and doped WO3, it can be concluded that 3%wt Fe-doped tungsten oxide provides the highest acceleration rate in photocatalytic degradation of furfural.
关键词： furfural,photocatalytic degradation,flame spray pyrolysis,tungsten oxide,doping
更新于2025-09-04 15:30:14
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High-temperature tungsten trioxides obtained by concentrated solar energy: physicochemical and electrochemical characterization
摘要： High-crystalline tungsten trioxides (WO3) have been synthesized by an environmentally friendly method using concentrated solar energy. The obtained tungsten trioxides (WO3) at three different temperatures and two oxygen mole fractions used for the highest synthesis temperature were characterized by XRD, SEM, and XPS. Higher crystallinity and concentration of W5+ was observed in tungsten trioxides as the synthesis temperature increased. Nevertheless, despite of the different synthetic conditions used, a mixture of two different crystalline structures was observed in all solar-prepared tungsten trioxides: monoclinic and triclinic. Comparing oxides obtained at 1000 °C, higher concentration of W5+ and more defects were found when using lower oxygen molar fraction (WO3-1000-2). Their electrochemical performance was evaluated using cyclic voltammetry (CV) in a conventional three-electrode cell in the following three aqueous electrolytes: acidic, alkaline, and neutral media. In the acidic medium, all the tungsten trioxides showed a capacitive behavior, which was enhanced for oxides obtained at 1000 °C due to a mixed valence of W. On the other hand, in the alkaline medium, a catalytic behavior was detected with higher activity towards hydrogen evolution reaction for the oxide with more defects, higher crystallinity, and monoclinic phase, obtained at 1000 °C and a lower oxygen molar fraction in the synthesis. Finally, in the neutral medium, the oxides synthesized at 1000 °C presented a capacitive behavior whereas the oxides prepared at the lowest temperatures (600 and 800 °C) presented electrochemical processes related to a catalytic behavior for water reduction, which must correspond to their minor concentration of defects, as confirmed by XPS.
关键词： High-temperature synthesis,Concentrated solar energy,Green synthesis,WO3,Tungsten trioxides
更新于2025-09-04 15:30:14