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Low-Voltage Operating Single-Wall Carbon Nanotube Thin-Film Transistors Using High Work Function Contacts on Flexible Substrates
摘要： There have been constant attempts as regards high-performance thin-film transistors (TFTs) by improving the charge injection between the source/drain electrode (S/D) and the channel. In this paper, we investigate the effect of the electric contact on the device performance of single-wall carbon nanotube (SWCNT) TFTs employing the suitable work function material. In order to realize the electric contacts for the dominant hole injection between the S/D and the SWCNT active channel, a high work function material of molybdenum trioxide (MoOx) fabricated by an optimized process are utilized. The contact resistance is extracted by plotting the width-normalized resistance of SWCNT-TFT with Pd and MoOx contacts as a function of channel length. We also demonstrate low-voltage operating SWCNT TFTs on flexible polyimide substrates with the reduced electric contacts. Without a buffer film which has been widely used to improve the device performance of TFT on a flexible substrate, high-performance low-voltage operating SWCNT-TFTs were achieved.
关键词： Flexible Substrate,Charge Injection,Device Performance,High Work Function Contacts,SWCNT TFTs
更新于2025-09-04 15:30:14
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Macular Pigment and Visual Performance in Low-Light Conditions
摘要： By reducing rod intrusion and improving efficiency of neural signaling throughout the visual system, macular pigment (MP) could improve many aspects of visual performance in low-light level conditions. Our study examined this possibility for a variety of visual performance parameters, including spatial resolution, dark adaptation kinetics, and color detection.
关键词： light/dark adaptation,macular pigment,lutein,visual acuity,visual performance
更新于2025-09-04 15:30:14
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Advanced Materials for Electromagnetic Shielding (Fundamentals, Properties, and Applications) || Mechanical Performance Characterization of EMI Shielding Materials Using Optical Experimental Techniques
摘要： In this chapter, the full field optical experimental methods for characterizing the mechanical performance of EMI shielding materials have been discussed. Interest in this type of physical problem is motivated by its importance in many practical applications. One major disadvantage of the use of optical techniques in characterizing the mechanical performance of EMI shielding materials is their full field and noncontact with the materials. The information outlined in this chapter may help researchers and engineers in their study of the unknown features of related complex systems for technological applications in characterizing EMI shielding materials.
关键词： EMI shielding materials,photoelastic method,digital gradient sensing,mechanical performance,moiré interferometry,digital image correlation,coherent gradient sensing,optical experimental techniques
更新于2025-09-04 15:30:14
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Energetic, economic and environmental (3E) analyses and LCOE estimation of three technologies of PV grid-connected systems under different climates
摘要： Recently, solar energy is considered as the most promising renewable energy source, due to the availability and advancement of the solar technologies. This paper presents an extensive energy, economic and environmental analysis of 2.04 kWp of polycrystalline (p-Si), 2.04 kWp of monocrystalline (m-Si) and 1.86 kWp of amorphous on microcrystalline (a-Si/μc-Si) identical PV systems installed on the rooftop of 20 different institutional buildings, located in various Moroccan sites. Based on the analysis conducted, annual results are predicted with respect to hourly meteorological data and performance characteristics of each technology are examined using energetic, economic and environmental indexes (3E analysis). Daily simulation results were compared with actual recorded data for one of the geographical site (Meknes city) and good matching between simulated and recorded data has been achieved to prove its validity. The energetic analysis has shown that poly-Si modules surpassed the mono-Si and amorphous-Si modules in terms of performance, capacity factor and conversion efficiency. Besides, economic analysis has been conducted to determine the discounted payback period and levelized cost of electricity (LCOE) for 20 Moroccan cities and the results have shown that p-Si, m-Si and a-Si/μc-Si offered the 20-city average of 17.1, 21.6 and 28.6 years payback period, respectively. Moreover, LCOE has been determined for each city and the results reveal that p-Si, m-Si and a-Si/μc-Si types PV modules presented the average of 9.02, 10.13 and 12.53 cent€/kWh, respectively. Finally, the environmental analysis has revealed that average of 1.316, 1.286 and 1.051 tons of CO2 per kWp can be reduced by adopting the p-Si, m-Si and a-Si/μc-Si PV modules in the studied locations. The findings confirm the potential of the examined technologies and elucidate specific conclusions for the practice of such systems under Morocco’s climate.
关键词： Performance,Environmental impact,Economic analysis,Grid-connected PV
更新于2025-09-04 15:30:14
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Citric acid-modulated in situ synthesis of 3D hierarchical Bi@BiOCl microsphere photocatalysts with enhanced photocatalytic performance
摘要： 3D hierarchical Bi@BiOCl microspheres were successfully synthesized by a facile solvothermal method using citric acid as a modulating agent and the growth process was revealed. The modulation of citric acid not only reduced the size of BiOCl nanosheets, finally transforming BiOCl microflowers into microspheres, but also induced the in situ reductive deposition of metallic Bi on the surface of the microspheres. Consequently, Bi@BiOCl microspheres showed larger specific surface areas and total pore volumes, higher absorptivity to the visible light and better charge transfer ability than BiOCl microflowers. As a result, Bi@BiOCl microspheres exhibited much better photocatalytic performance than BiOCl microflowers. Bi@BiOCl microspheres modulated by 2.8 g citric acid showed the highest photocatalytic activity, which was 4.4 and 2.5 times higher than BiOCl microflowers in degrading RhB under visible light and salicylic acid under UV light, respectively. This work may provide a new insight into simultaneous size control and in situ metal deposition for Bi-containing photocatalysts and other materials.
关键词： solvothermal method,Bi@BiOCl microspheres,photocatalytic performance,citric acid modulation,in situ reductive deposition
更新于2025-09-04 15:30:14
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Construction of Ti3+ self-doped TiO2/BCN heterojunction with enhanced photoelectrochemical performance for water splitting
摘要： Ti3+ self-doped TiO2/BCN heterojunction (Ti3+-TiO2/BCN) was constructed via a hydrothermal method with using NaBH4 as reducing agent. The BCN nanosheets function as a good support to block the agglomeration of Ti3+-TiO2 nanoparticles, which decreased the recombination of photogenerated charge carriers. The Ti3+-TiO2/BCN sample exhibited enhanced electronic conductivity and absorption in visible light region because of the introduction of Ti3+ and oxygen vacancies (Ov). The as-prepared Ti3+-TiO2/BCN sample showed enhanced photoelectrochemical (PEC) performance as confirmed by analyses of LSV, EIS, Bode plots and M–S. Under the visible light irradiation, the optimally Ti3+ self-doped TiO2/BCN heterojunction sample yield a photocurrent density of ～ 0.69 mA/cm2 at 1.23 V versus RHE, which is over three times as high as BCN and TiO2/BCN at the same conditions.
关键词： hydrothermal method,photoelectrochemical performance,NaBH4,water splitting,Ti3+ self-doped TiO2/BCN heterojunction
更新于2025-09-04 15:30:14
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Second generation linear focus sun simulator to test optical performance of parabolic trough receivers - OptiRec
摘要： This paper presents results from a characterization of DLR’s second generation sun simulator test facility (OptiRec) for determining the optical performance of parabolic trough receivers. The configuration of the test bench is an elliptical mirror trough with flat end mirrors. Solar simulator lamps are situated in one focal line, the receiver in the other focal line. Water at ambient temperature flows through the receiver and allows for a calorimetric measurement of the absorbed power. Compared to the first generation test bench (ElliRec) the mirror material is changed from aluminum to glass, the ellipse size is changed and the handling is improved. Based on 34 measurements of the absorbed power the repeatability for OptiRec measurements is measured to 0.13% (1σ), compared to 0.2% in the ElliRec. Seven receivers from different manufacturers are measured in both test benches yielding consistent relative optical efficiency with <1.1% deviation. Particular differences are larger than the repeatability, which are attributed to differences in spectra and incidence angles between both test benches.
关键词： sun simulator,optical performance,calorimetric measurement,parabolic trough receivers,repeatability
更新于2025-09-04 15:30:14
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Fabrication of large surface area nitrogen vacancy modified graphitic carbon nitride with improved visible-light photocatalytic performance
摘要： In this work, nitrogen vacancy modified graphitic carbon nitride (g-C3N4) with large surface area was synthesized and analyzed by a series of instruments, including XRD, FTIR, XPS, EPR SEM, TEM, DRS and PL, etc. and the photocatalytic H2-evolution activity was investigated. The results indicated that the as-synthesized g-C3N4 with nitrogen vacancy exhibited stronger visible light response capability, enlarged specific surface area and notably separated rate of photoinduced charge carriers, which caused the as-synthesized photocatalyst possessing the higher hydrogen evolution rate (5250 μmol h?1 g?1) and excellent recycle stability. Evidently, this work could provide a new insight for preparing highly efficient photocatalyst.
关键词： Large surface area,Nitrogen vacancy,Photocatalysis,g-C3N4,Photocatalytic performance
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC) - Budapest, Hungary (2018.8.26-2018.8.30)] 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC) - Impact of the Different Parasitic Inductances on the Switching Behavior of SiC MOSFETs
摘要： This paper experimentally investigates into the effects of parasitic inductances on the switching performance of a SiC MOSFET halfbridge. As the switching dynamics of wide-bandgap power semiconductors are by magnitudes larger compared to silicon devices, the parasitic elements in the switching cell become increasingly important, as they limit the current and voltage slopes and cause oscillations. A thorough understanding of those effects is necessary for the design of highly efficient and integrated next-generation power electronic converters. An implementation method to realize cheap and well-reproducible variable inductors in the nanohenry range is presented. Furthermore, a test PCB equipped with SiC MOSFETs is built and double pulse experiments are carried out under the variation of all relevant inductances in the switching cell. The results are analyzed with respect to the switching performance and differences between the switching transients of Si and SiC devices are demonstrated and explained with respect to the parasitic elements.
关键词： switching performance,power electronics,parasitic inductances,double pulse experiments,SiC MOSFET
更新于2025-09-04 15:30:14
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[IEEE 2018 24th International Conference on Pattern Recognition (ICPR) - Beijing, China (2018.8.20-2018.8.24)] 2018 24th International Conference on Pattern Recognition (ICPR) - Confidence-Driven Network for Point-to-Set Matching
摘要： The goal of point-to-set matching is to match a single image with a set of images from a subject. Within an image set, different images contain various levels of discriminative information and thus should contribute differently to the results. However, the discriminative level is not accessible directly. To this end, we propose a confidence driven network to perform point-to-set matching. The proposed system comprises a feature extraction network (FEN) and a performance prediction network (PPN). Given an input image, the FEN generates a template, while the PPN generates a confidence score which measures the discriminative level of the template. At matching time, the template is used to compute a point-to-point similarity. The similarity scores from different samples in the set are integrated at a score level, weighted by the predicted confidence scores. Extensive multi-probe face recognition experiments on the IJB-A and UHDB-31 datasets demonstrate performance improvements over state of the art algorithms.
关键词： feature extraction network,performance prediction network,multi-probe face recognition,confidence driven network,point-to-set matching
更新于2025-09-04 15:30:14