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Broad tunability of emission wavelength by strain coupled InAs/GaAs <sub/>1???x</sub> Sb <sub/>x</sub> quantum dot heterostructures
摘要： Tuning of the photoluminescence emission over a wider range of optical telecommunication wavelength (1.38 μm–1.68 μm) has been achieved by employing a GaAs1 ? xSbx capping layer to the strain coupled bilayer InAs quantum dot (QD) heterostructures. It is shown that the modulation of strain between the two dot layers through variation in Sb-content and thickness of the capping layer strongly influence the dot size. The band alignment transformation from type-I to type-II is observed for high Sb-content in the capping layers. In addition, the carrier lifetime is improved by a factor of three in the QD heterostructures having type-II band alignment. This, we believe, is of importance for optoelectronic device applications.
关键词： GaAs1 ? xSbx capping layer,carrier lifetime,optoelectronic device applications,photoluminescence emission,strain coupled bilayer InAs quantum dot,type-I to type-II band alignment,optical telecommunication wavelength
更新于2025-09-12 10:27:22
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All-optical modulator based on reduced graphene oxide coated D-shaped fiber waveguide
摘要： An all-optical modulator of reduced graphene oxide coated D-shaped fiber structure, utilizing a convenient and controllable evanescent-field-induced deposition method, was designed in this study. By using the pump pulse at 980 nm, the signal light at 1550 nm was modulated with the rate of 50 kHz, and the maximum modulation depth of 8 dB was obtained using this device. Furthermore, this kind of modulator features strong mechanical stability, ease of fabrication, low cost and compatibility with optical fiber systems, which implies great potential in photonics applications such as all-optical switching and all-optical communication.
关键词： D-shaped fiber,photonics applications,all-optical modulator,evanescent-field-induced deposition,reduced graphene oxide
更新于2025-09-12 10:27:22
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A Single-switch Single-magnetic Core High Conversion Ratio Converter with Low Input Current Ripple and Wide Soft-switching Range for Photovoltaic Applications
摘要： In this paper, a novel high conversion ratio DC-DC converter suitable for photovoltaic applications is presented. Utilizing single-switch and single-magnetic core, low ripple input current and low voltage stress across the semiconductors are the major advantages of the proposed converter. In order to provide soft-switching condition for the converter switch at a wide range of output power, a passive lossless snubber is employed. The presented converter is adequate for photovoltaic applications due to mentioned properties. Operating principles are analyzed and design considerations are provided. In order to validate the theoretical analysis, a prototype of the proposed converter is implemented and the experimental results are exhibited.
关键词： single-switch,single-magnetic core,lossless passive snubber,High conversion ratio,soft-switching,photovoltaic applications
更新于2025-09-12 10:27:22
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Techniques to Investigate the Application of Cold Spray in Fabrication of Nanoplasmonic films: Parameter Identification
摘要： The decomposition of a complex system allows identification of its interacting variables. In this article the coupling between the Cold Spray (CS) thin film fabrication and functional properties in Surface Plasmon Polaritons (SPP) are investigated with a view to optimise the CS fabrication process in nano thin films. There are many reported advantages of the cold gas spray over other thermal spray technologies. However the fabrication of thin films by cold gas is limited on the capability of the transport system. This study is meant on finding ways to improve the cold gas spray for deposition of nano particles. In particular, the deposition of plasmonics nano particles for functional films in the nano scale regime. Since the requirements for each film application are different, this study is specifically targeted at films used in biosensor technology with a focus on the plasmonics sensor that use gold or silver nano particles. The paper gives the details of the parameter identification process that was used to determine missing links between the cold spray process and the optical functional thin film characteristics. In the preliminary study, intuitively, the systems engineering and pattern recognition techniques were used to explore the most probable driving variables for the cold gas coating process in functional films. This process determines the deposition parameters that characterize the surface roughness, interface roughness and film thickness as would be required for functional thin films. We have since designed a systematic numerical process for the iterations towards this direction. This study opens new avenues for further research and advancement of the cold gas spray method in nano thin film.
关键词： cold spray applications,Multiple Particle Impact,system identification,plasmonics thin films
更新于2025-09-12 10:27:22
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Development of Photovoltaic Module with Fabricated and Evaluated Novel Backsheet-Based Biocomposite Materials
摘要： Photovoltaic backsheets have considerable impact on the collective performance of solar cells. Material components should withstand certain temperatures and loads while maintaining high thermal stability under various weather conditions. Solar modules must demonstrate increased reliability, adequate performance, safety, and durability throughout the course of their lifetime. This work presents a novel solar module. The module consists of an innovative polyvinylidene fluoride-short sugar palm fiber (PVDF-SSPF) composite backsheet within its structure. It was electrically and thermally evaluated. The current-voltage characteristics (I-V) were obtained using the solar module analyzer, PROVA 210PV. A thermal evaluation was accomplished using a temperature device, SDL200. The thermal test consisted of two different assessments. The first targeted the surface and backsheet of the developed module to correlate their performance from within. The second assessment compared the thermal performance of the fabricated backsheet with the conventional one. Both tests were combined into a heatmap analysis to further understand the thermal performance. Results revealed that the developed module exhibited reasonable electrical efficiency, achieving appropriate and balanced I-V curves. PVDF-SSPF backsheets proved to be thermally stable by displaying less heat absorbance and better temperature shifts. Additional research efforts are highly encouraged to investigate other characteristics. To enhance performance, further analyses are needed such as the damp heat analysis, accelerated aging analysis, and heat dissipation phenomena.
关键词： photovoltaic applications,electrical and thermal performances,novel backsheets,solar modules
更新于2025-09-12 10:27:22
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Underwater performance of thin-film photovoltaic module immersed in shallow and deep waters along with possible applications
摘要： This article presents the experimental results of the underwater performance of amorphous silicon (a-Si) thin-film photovoltaic (TFPV) module. Electrical performance characteristics (current, voltage, power input, power output, and power conversion efficiency) of a-Si TFPV are evaluated considering the two installation conditions of Submerged Photovoltaics (SPV): shallow and deep waters. Experimental results showed that the a-Si TFPV could convert sun energy into electricity even in underwater environments. It is observed that there is a little drop in power outputs in deep waters than to shallow waters due to the variation in incident sunlight on to the photovoltaic (PV) module. Based on the outcome, few possible applications for underwater PV system are explored. The article is concluded by highlighting few critical points for future research.
关键词： Photovoltaics,thin films,underwater PV applications,underwater photovoltaics,underwater PV performance,sub-merged PV,PV in deep waters,floating photovoltaics,power conversion efficiency,PV cells
更新于2025-09-12 10:27:22
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New organic molecular based on Bis-Dipolar Diphenylamino-EndcappedOligo Aryl Fluorene Application for organic solar cells
摘要： In this work, we report on the structural, optical and electronic properties of a series of D-π-A-π-D type bis-dipolar Diphenylamino-Endcappedoligoarylfluorenes, (OF(2)Ar-NPh(2)). These molecules are studied by means of quantum chemical calculations based on density functional theory (DFT) using B3LYP functional with 6-31G(d,p) for all atoms and all states (ground and excited ). The study of the geometrical parameters, ground state (p, n) showed that the structures of these molecules are planar. As a result, the electronic properties HOMOs, LUMOs, energy gaps, were determined from the fully optimized structures. The absorption of these molecules were calculated using (TD-DFT)-B3LYP/631G (d,p) method. This fundamental information is a valuable data in designing and making promising materials for optoelectronic applications.
关键词： Optoelectronic applications,DFT,Organic,Photovoltaic cells
更新于2025-09-12 10:27:22
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Mechanoperovskites for Photovoltaic Applications: Preparation, Characterization, and Device Fabrication
摘要： Hybrid organic?inorganic metal halide perovskites (MHPs) have emerged as excellent absorber materials for next generation solar cells owing to their simple solution-processed synthesis and high efficiency. This breakthrough in photovoltaics along with an accompanying impact in light-emitting applications prompted a renaissance of interest in the broad family of MHPs. Notably, the optoelectronic properties and the photovoltaic parameters of MHPs are highly sensitive to the adopted synthetic strategy. The preparation of MHPs has commonly relied on solution-based methods requiring elevated temperatures for homogeneity of reaction mixtures. While the solution-based approach is relatively versatile, it faces challenges such as limitations in compositional engineering of MHPs or their long-term storage among others. Therefore, there is a continuous great challenge to develop efficient synthetic strategies affording various high-quality MHP materials for numerous technological optoelectronic applications.
关键词： Preparation,Characterization,Device Fabrication,Photovoltaic Applications,Mechanoperovskites
更新于2025-09-12 10:27:22
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Optimization of Laser Shock Peening For Titanium
摘要： Present competitive world is looking for Components with high strength and fatigue resistance finding their applications in aerospace, turbine parts and especially bio-medical devices with high bio-compatibility. Advanced engineering techniques are required to produce parts of higher complexities and desirable surface qualities. Laser peening stood first in a row of all various surface treatments of metallic component. A Fundamental purpose of nobility of the nearby variations in residual stress that happen inside the processed region, that are sensitive to processing variables and not effectively measured tentatively. The rule of residual .stress .is important .in guaranteeing .the nobility of engineering segments and Laser. Shock. Peening (LSP) process .can be utilized to great impact to present the gainful compressive residual . stress .levels as required. It is, nonetheless, hard to utilize ordinary laser . peening .rule .frameworks to set up the perfect peening .state that . will bring about the best .execution. This .paper.. results .from .a study .to optimize the .laser .peening .parameters . for a typical . titanium.. ND- YAG laser equipment was taken for the experimental work and statistical Taguchi technique was .used .to bound .the number .of experiments .necessary .for optimization .to be feasible.
关键词： Fatigue life,Taguchi Technique,Biomedical applications,Laser peening
更新于2025-09-12 10:27:22
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[IEEE 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Sao Paulo, Brazil (2019.10.7-2019.10.9)] 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Optical Fiber Specklegram Sensors for Measurement of Liquids : (Invited Paper)
摘要： Optical ?ber specklegram sensors explore the spatiotemporal properties of the speckle pattern projected from a multimode ?ber due to the interference between the several propagating modes. Albeit the speckle ?elds carry detailed and reproducible information about the ?ber status. Specklegram changes can be analyzed to obtain very sensitive measurements with simple interrogation schemes. In this paper, different setups of ?ber specklegram sensors for assessing the physical and chemical properties of liquids, such as refractive index, viscosity, and evaporation rate, are presented. The experiments are carried out using both silica multimode ?bers and structured waveguides, whereas the output speckle ?elds are processed by means of correlation and image processing techniques.
关键词： ?ber specklegram sensor,optical ?ber sensors,optical ?ber applications,chemical sensors
更新于2025-09-12 10:27:22