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ZIF-8@H:ZnO Core-shell nanorods arrays/Si heterojunction self-powered photodetector with ultrahigh performance
摘要： The native defects will degrade the performance and stability of the optoelectric device. Herein, a zeolitic imidazolate framework-8 (ZIF-8)@H:ZnO core-shell nanorods arrays/Si heterojunction self-powered photodetector is demonstrated. Combining hydrogenation and ZIF-8 passivation, its photoresponsive characteristics are greatly enhanced. The photodetector exhibits superior detectivity of ~2.14×1016 Jones (1 Jones=1 cm Hz1/2 W-1), high responsivity of ~7.07×104 mA W-1, prominent sensitivity of ~2.08×1012 cm2 W-1 and broadband photodetection ranging from the ultraviolet to the near infrared. As critical figures of merit, its responsivity increases by nearly 5 orders of magnitude than that of pristine ZnO nanorods arrays/Si heterojunction photodetector. More importantly, the comprehensive performance of ZIF-8@H:ZnO core-shell nanorods arrays/Si heterojunction photodetector not only achieves a record high value for ZnO-based photodetectors reported so far, but also can be comparable with that of two-dimensional (2D) materials, zero-dimensional (0D) materials, topological insulators, perovskites and other oxides based self-powered photodetectors. The novel post-treatment strategy has great potential in developing high-performing self-powered photodetectors. Meanwhile, this work may be extended to other oxides based optoelectronic devices.
关键词： core-shell nanorods,heterojunction,passivation,self-powered photodetector,ZnO,ZIF-8,hydrogenation
更新于2025-11-14 17:04:02
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Influence of Electrochemical Hydrogenation on the Circular Photocurrent in the Ag/Pd Nanocomposite
摘要： This work reports on a circular photocurrent in Ag/Pd nanocomposite films. The films, containing metal (Ag-Pd) and semiconductor (PdO) nanocrystallites in amorphous lead-silicate glass, are modified by electrochemical hydrogenation in a sulfuric acid solution. The photocurrent in the modified nanocomposite films is excited by nanosecond laser pulses at wavelengths of 532, 1064, and 1550 nm. In order to determine the circular and linear contributions in a transverse photocurrent, the dependences of the photocurrent on the degree of circular polarization of the exciting radiation are investigated. It is found that the electrochemical hydrogenation modification leads to a significant decrease of the electrical resistance and the polarization-sensitive transverse photocurrent in the films. It is also found that electrochemical hydrogenation significantly affects the ratio of the circular and the linear photocurrent components. The photocurrent is found to be generated on the subsurface layer of the films in the absence of crystalline phase component PdO.
关键词： circular photocurrent,Ag/Pd nanocomposite,electrochemical hydrogenation
更新于2025-11-14 15:13:28
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Enhanced photocatalytic activity of hydrogenated BiVO4 with rich surface-oxygen-vacancies for remarkable degradation of tetracycline hydrochloride
摘要： In this work, for the first time the hydrogenation treatment was employed to introduce oxygen vacancies on the surface of BiVO4 (BVO) particles, and the influence of hydrogenation on the morphological structure and photocatalytic activity of BVO was explored. Compared to the pristine BVO, a disordered amorphous layer was observed on the surface of the hydrogenated BVO (HBVO) sample. The disordered layer was due to the formation of surface oxygen vacancies in HBVO, as verified by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectra. Meanwhile, the band gap of HBVO was slightly narrowed accompanying with a higher optical absorption ability. The photocatalytic measurements demonstrated that under 30 min visible light (λ ≥ 420 nm) illumination the HBVO sample could photocatalytically degrade 98% of tetracycline hydrochloride (TCH), which was much higher than the pristine BVO (~52%), and the calculated pseudo-first-order degradation rate constant (k) of HBVO (~0.118 min?1) was about 5 times that of BVO, confirming that the hydrogenation treatment could significantly improve the photocatalytic activity of BVO. In addition, the photocatalytic mechanism of HBVO for enhanced photocatalytic TCH removal was also discussed. The present work demonstrates the feasibility of employing the hydrogenation treatment to develop highly efficient visible light BVO-based photocatalysts for photocatalytic removal of antibiotics, and also deepens the understanding of the correlation between surface oxygen vacancies and photocatalytic performance of semiconductor photocatalysts.
关键词： BiVO4,Photocatalytic activities,Tetracycline hydrochloride removal,Hydrogenation,Surface oxygen vacancies
更新于2025-09-23 15:23:52
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Modulating electronic and magnetic properties of zigzag MoSe2 nanoribbons with different edge structures
摘要： In this paper, we performed the first-principles calculations to investigate the effect of different edge structures on stability, electronic and magnetic properties of zigzag MoSe2 nanoribbons and their corresponding variation by saturating the ribbon edges with H. We have taken twelve patterns of edge structure into consideration due to the chemical nonequivalence of Mo and Se atoms. We found that H-NR-u and H-NR-s have the highest stability by analysing binding energies. Specially, all of the zigzag MoSe2 nanoribbons exhibit obvious metallicity, whether they are hydrogenated or not. What's more, the pristine and hydrogenated zigzag nanoribbons have stable ferrimagnetism with a wide range of total magnetic moment 0.27–3.59 μB. The Mo-terminated nanoribbon has the largest magnetic moment and hydrogenation can significantly reduce the magnetic moment of nanoribbons. We also reveal zigzag MoSe2 nanoribbons with same terminal have very similar stability, electronic and magnetic properties, which have nothing to do with the symmetry of the system. Above all, these unique properties of zigzag MoSe2 nanoribbons have the great potential for electronic, spintronic and magnetoresistive nano-devices in the future.
关键词： Hydrogenation,Nanoribbon,Ferrimagnetism,First-principle calculation,MoSe2
更新于2025-09-23 15:23:52
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Dual-Route Hydrogenation of the Graphene/Ni Interface
摘要： Nanostructured architectures based on graphene/metal interfaces might be efficiently exploited in hydrogen storage due to the attractive capability to provide adsorption sites both at the top side of graphene and at the metal substrate after intercalation. We combined in situ high resolution x-ray photoelectron spectroscopy and scanning tunneling microscopy with theoretical calculations to determine the arrangement of hydrogen atoms at the graphene/Ni(111) interface at room temperature. Our results show that at low coverage H atoms predominantly adsorb as monomers and that chemisorption saturates when ～25% of the surface is hydrogenated. In parallel, with a much lower rate, H atoms intercalate below graphene and bind to Ni surface sites. Intercalation progressively destabilizes the C-H bonds and triggers the release of the hydrogen chemisorbed on graphene. Valence band and near edge absorption spectroscopy demonstrate that the graphene layer is fully lifted when the Ni surface is saturated with H. Thermal programmed desorption was used to determine the stability of the hydrogenated interface. Whereas the H atoms chemisorbed on graphene remain unperturbed over a wide temperature range, the intercalated phase abruptly desorbs 50-100 K above room temperature.
关键词： storage,graphene,intercalation,desorption,nickel,hydrogenation
更新于2025-09-23 15:23:52
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[IEEE 2018 International Semiconductor Conference (CAS) - Sinaia, Romania (2018.10.10-2018.10.12)] 2018 International Semiconductor Conference (CAS) - The Effect of H<inf>2</inf>/Ar Plasma Treatment Over Photoconductivity of Sige Nanoparticles Sandwiched Between Silicon Oxide Matrix
摘要： The effect of room temperature hydrogen plasma treatment on the photoconductive properties of the SiO2 matrix containing SiGe nanoparticles is investigated. A considerable increase in photocurrent intensity is observed after plasma treatment. The increase is partly attributed to neutralization of dangling bonds around the nanoparticles and partly to passivation of non-radiative centers and defects in the matrix and at the nanoparticles-matrix interfaces.
关键词： hydrogenation,magnetron sputtering,photoconductivity,HiPIMS,SiGe,SiO2
更新于2025-09-23 15:22:29
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Thermodynamic Simulation of Polysilicon Production in Si-H-Cl System by Modified Siemens Process
摘要： A study on thermodynamics of the various steps involved in the polysilicon manufacture in the Siemens process is presented in this paper. The synthesis of SiHCl3 (TCS), silicon deposition from SiHCl3 and hydrogenation of by-production SiCl4 (STC) for recycle are the main processes studied in this paper. Based on the thermodynamic data for related pure substances, the relation of (nCl/nH)Eq (i.e. the mole ratio of Si to Cl at equilibrium) and the feeding mole ratio of Cl to H (nCl/nH) was plotted in the Si-Cl-H system. Then, the effects of temperature, pressure and feed fraction on TCS selectivity in the synthesis of SiHCl3 process, polysilicon yield in the silicon deposition process and SiCl4 conversion ratio in the SiCl4 hydrogenation process have been studied. Useful conclusions for improving these processes have been drawn. Finally, the optimum conditions have been obtained and compared with limited published data in the literature. The results show that comparison with the limited reported values in the literature indicates that the operating conditions are close to those predicted by the thermodynamics for all three reactions. However, the reported conversion or yield is lower. It is hoped that this paper makes a contribution as future polysilicon plants move to higher capacity and seek a reduction in the cost of production.
关键词： Siemens Process,Silicon Deposition,Thermodynamics,Hydrogenation
更新于2025-09-23 15:22:29
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Metal-enhanced hydrogenation of graphene with atomic pattern
摘要： Graphene hydrogenation is an attractive approach to functionalize graphene. However, the hydrogenating treatment could only be achieved under harsh conditions due to the weak hydrogen affinity of graphene. It has also made the direct writing of electronic circuits on graphene by hydrogenation very difficult. Here we propose a metal-enhanced approach to hydrogenate graphene with atomic pattern that enables to produce hydrogenation pattern on demand. First-principles calculations reveal that certain metals (Cu, Ag, Al) attached to graphene can significantly lower the energy barrier for hydrogen binding process, while the hydrogen binding energy itself is much enhanced. Such metal-promoted hydrogenation is spatially localized, which paves the way to precisely write pre-designed hydrogenation patterns on graphene with well-controlled metallic clusters and tips.
关键词： bandgap,hydrogenation,Graphene,H-decoration pattern,metal-assisted lithography
更新于2025-09-23 15:21:21
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Effects of Anisotropy Field and Easy Axis Dispersions on Squareness Ratio for HDDR-Processed Nd-Fe-B Powders
摘要： Nd-Fe-B magnetic powders produced by the hydrogenation-decomposition-desorption-recombination process have a lower squareness ratio than sintered magnets. In this paper, the anisotropy ?eld (Hk) distribution was assumed to be a horizontally ?ipped lognormal distribution and the effect of the Hk dispersion on the squareness ratio was investigated by using a micromagnetic simulator. As a result, the squareness ratio was very similar to the experimental demagnetization loop, when (cid:2)Hk(cid:3) was 5500 kA/m and σ Hk/(cid:2)Hk(cid:3) was 30%. Moreover, we investigated the easy axis dispersion of grains on squareness ratio in consideration of soft magnetic or nonmagnetic grain boundaries. As a result, the squareness ratio for the nonmagnetic grain boundary was closer to the experimental value; however, it is dif?cult to describe the experimental demagnetization loop by only considering the easy axis dispersion.
关键词： hydrogenation-decomposition-desorption-recombination (HDDR)-processed Nd-Fe-B,horizontally ?ipped lognormal distribution,Anisotropy ?eld and easy axis dispersions,squareness ratio
更新于2025-09-23 15:21:21
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Study on the improvement of p-type multi-crystalline silicon material for solar cells by the hydrogenation with electron injection
摘要： In this paper, we have found that the ef?ciency of p-type mono-crystalline silicon (mono-Si) passivated emitter and rear contact (PERC) solar cells can be increased by 0.12%abs. with the process of hydrogenation with electron injection (HEI). However, the same scheme was not suitable for p-type multi-crystalline silicon (mc-Si) solar cells. To promote power conversion ef?ciency (PCE) for the mc-Si solar cells, we have explored a developed HEI process for the mc-Si solar cells to improve the device performance. Meanwhile, we also analysed the mechanization inside the solar cells after applying the HEI process. Through the design of experiment (DOE), the correlation among injection current, temperature, injection time and ef?ciency improvement was analysed in detail. It was proved that mc-Si solar cells require higher current injection and temperature to passivate the complex impurities in the bulk, when compared to mono-Si solar cells. With the optimal scheme explored by this paper, the open circuit voltage (Uoc), short circuit current density (Jsc) and ?ll factor (FF) of p-type mc-Si solar cells, respectively, increased by 1.2 mV, 0.11 mA cm?2 and 0.05%abs., respectively. The ef?ciency was improved about 0.11 ± 0.005%abs.. These results will provide a certain method and basis for further improving the ef?ciency of mc-Si PERC cells and overcoming the light-elevated temperature-induced degradation by HEI process.
关键词： Hydrogenation,ef?ciency improvement,p-type mc-Si material,solar cells
更新于2025-09-23 15:21:01