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Oxygen controlled E-beam evaporation deposited p-SnOx thin film for photosensitive devices
摘要： Thin SnOx films of different thicknesses at different oxygen pressures were deposited on glass substrate using reactive E-beam evaporation technique. Significant changes in the optical and structural properties of the films with change in oxygen pressure are observed. Experimentally obtained absorption coefficient and band gap of SnOx suggests its prospective use as suitable absorber material for photoconductive and photovoltaic devices. In addition to the oxygen pressure, thickness of SnOx layer has also an important role on its optical and structural properties.
关键词： Semiconductor,Tin oxide,Optical property,Crystal structure,Thin film
更新于2025-09-19 17:13:59
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Gold Nanobipyramid Enveloped in Alloyed Nanoshell for Stable Plasmonic Sensors
摘要： Compared to monometallic nanoparticles, alloyed and bimetallic nanostructures are of great interest for their high stability and improved physicochemical properties. In this work, an effective method has been developed to obtain core-shell nanorods, in which the core is uniform gold nanobipyramids (AuBPs) enveloped in AuxAg1-x alloyed nanoshell. The penta-twinned AuBP@AuxAg1-x nanorods with x ranging from 0 to 1 integrate the advantages of AuBPs core and AuAg alloy shell effectively. Specifically, they combine the superiority of Au and Ag, exhibiting excellent both thermal and chemical stability, high refractive index sensitivity, and stable surface-enhanced Raman scattering (SERS) effect in harsh environment. Furthermore, the surface plasmon resonance of AuBP@AuxAg1-xNRs could be finely tailored in a large wavelength region with a narrow full width at half maximum (FWHM) by simply varying the alloy shell thickness and the AuBPs core size. These improved properties offer the obtained core-shell nanostructures novel and viable perspectives in severe environments. The simple and feasible synthetic strategy is also versatile to fabricate other noble metallic nanostructures enveloped in alloyed nanoshell.
关键词： sensitivity,alloy nanoshell,gold nanobipyramids,stability,optical property
更新于2025-09-19 17:13:59
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31.4: <i>Invited Paper:</i> Recent Development of Soluble Hole Injection Material for Printed OLED and QLED Display
摘要： We are developing the soluble hole injection materials and the inks, named ELsource? that can be used as hole injection layer in OLED display. OLED display is one of optical device. Therefore, we developed the hole injection materials with optical properties necessary for that optical devices. We also developed the hole injection material with the deeper ionization potential applicable to QLED display.
关键词： Hole injection layer,Ionization potential,HIL,Refractive index,HIM,Printed,OLED,Optical property,Hole injection material,QLED,Soluble
更新于2025-09-19 17:13:59
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Effect of Si substrate modification on improving the crystalline quality, optical and electrical properties of thermally-evaporated BaSi2 thin-films for solar cell applications
摘要： We have grown orthorhombic barium disilicide (BaSi2) thin-films on modified silicon (Si) substrates by a thermal evaporation method. The surface modification of Si substrate was performed by a metal-assisted chemical etching method. The effects of etching time te on crystalline quality as well as optical and electrical properties of the BaSi2 films were investigated. The obtained results showed that substrate modification can enhance the crystalline quality and electrical properties; reduce the light reflection; and increase the absorption of the BaSi2 thin-films. The te of 8 s was chosen as the optimized condition for surface modification of Si substrate. The achieved inferred short-circuit current density, Hall mobility, and minority carrier lifetime of the BaSi2 film at te of 8 s were 38 mA/cm2, 273 cm2/Vs, and 2.3 μs, respectively. These results confirm that the BaSi2 thin-film evaporated on the modified Si substrate is a promising absorber for thin-film solar cell applications.
关键词： hall mobility,substrate modification,photoresponse,silicide semiconductor,Barium disilicide,minority carrier lifetime,optical property,thermal evaporation
更新于2025-09-19 17:13:59
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Density Functional Theory Investigation of Nonlinear Optical Properties of T-Graphene Quantum Dots
摘要： Using density functional theory calculations, we have analyzed nonlinear optical properties of a series of T-graphene quantum dots differing in their shape and size. Electronic polarizability, first-order and second-order hyperpolarizability of these systems are investigated and shed light on their stability and electronic properties. Negative cohesive energy shows that they are energetically stable. The effect of size and incident frequency on their nonlinear responses are comprehensively discussed. Most of the systems exhibit strong NLO response and it enhanced in the presence of external field. All these systems show absorption maximum ranging from UV to visible window. Overall, this theoretical framework highlighted the nonlinear optical properties of T-graphene quantum dots that may provide valuable information in designing potential NLO materials.
关键词： T-graphene quantum dot,electron delocalization,nonlinear optical property,UV-visible absorption spectra,Density functional theory
更新于2025-09-16 10:30:52
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Nonaqueous synthesis of TiO2 nanorods using inductively coupled plasma
摘要： Titanium dioxide (TiO2) nanorods are widely used in many fields such as self-cleaning surfaces, photocatalytic lithography and pollutant control, owing to their outstanding physical, chemical and optical properties. Traditional methods for synthesizing TiO2 nanorods are mostly tedious with high cost and tremendous energy consumption. In this work, TiO2 nanorods with excellent optical, electrochemical, and hydrophilic properties were rapidly synthesized on titanium alloy (TC4) by using inductively coupled plasma (ICP) with strong chemical reactivity and high temperature characteristic. XRD patterns and SEM images confirm the conversion of TC4 into rutile TiO2 nanorods after irradiated by ICP at 800 W for only one pass, and the nanorods tend to grow longitudinally under prolonged ICP processing. Moreover, the well-developed single-crystalline feature of TiO2 nanorod is affirmed by TEM test. To reveal the growth mechanism of TiO2 nanorods, three types of substrates (polished TC4 by electrochemical polishing (ECP), polished TA2 by ECP and oxidized TC4 by anodizing) were used to grow TiO2 nanorods. However, TiO2 nanorods with good morphology were only formed on the first type of substrate due to the existence of β phase Ti, which could suppress thermal transmission between grains. In addition, the results of UV–Vis absorption spectrum, electrochemical test, and static water contact angle of the treated TC4 samples show that TiO2 nanorods synthesized by ICP possess excellent optical, electrochemical, and hydrophilic properties.
关键词： Inductively coupled plasma,Hydrophilicity,Optical property,TiO2 nanorods,Thermal oxidation
更新于2025-09-12 10:27:22
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Interband optical absorption in wurtzite GaN/InxGa1?xN/GaN spherical quantum dots with built-in electric field
摘要： Based on the principle of density matrix and the finite element method, the interband optical absorption between the electron and hole has been investigated in a wurtzite GaN/InxGa1?xN/GaN spherical core–shell quantum dot (CSQD) including a strong built-in electric field (BEF). We have studied the effects of the size and the ternary mixed crystal on the optical absorption coefficients (ACs) and refraction index changes (RICs). The results indicate that the absorption peaks of ACs and RICs decrease rapidly, and show a redshift with the increase of the component x. It is also found that the absorption peaks of ACs and RICs reduce obviously and depend on the core radius and the well width. When the core radius increases, the positions of the maximum ACs and RICs show a blueshift. At the same time, it presents a redshift when the well width increases. Particularly, the influence of the well width is much stronger than the core radius in the wurtzite GaN/InxGa1?xN/GaN spherical CSQDs. We hope that these results could provide guidance on both theoretical and experimental study related to the optical properties of spherical CSQDs.
关键词： Core–shell quantum dot,built-in electric field,optical property,ternary mixed crystal effect
更新于2025-09-12 10:27:22
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Plasmonic Cu Nanostructures in ZnO as Hyperbolic Metamaterial Thin Films
摘要： Plasmonic metals, such as Cu and Al, have been considered as potential low-loss alternatives for Au and Ag for photonic structures and devices. However challenges remain in the fabrication and applications of Cu nanostructures, due to its easy oxidation issues. In this work, a new metamaterial structure of plasmonic Cu nanostructures embedded in a dielectric ZnO matrix has been designed and successfully fabricated using a one-step thin film growth method. The Cu-ZnO hybrid thin films present excellent epitaxial quality and exotic optical properties, such as strong localized surface plasmon resonance in the visible regime, and, highly anisotropic and hyperbolic optical response, revealed by angular dependent and polarization resolved reflectivity measurements. This hyperbolic plasmonic metamaterial via the metal-in-oxide matrix form combining low loss plasmonic Cu nanostructures and extraordinary anisotropic optical properties could be used towards various nanophotonic applications, such as plasmonic solar energy devices and hyperlens.
关键词： anisotropic optical property,Cu nanorods,metamaterial,self-assembled,low-loss plasmonic metal
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - Crystal Growth and Optical Property of GaN Nanowire Cores and GaInN/GaN Multi-Quantum Shells Grown by Metalorganic Vapor Phase Epitaxy
摘要： An n-GaN nanowire and a GaInN/GaN multi-quantum shell (MQS) were uniformly grown by the continuous flow mode MOVPE with the optimal growth condition. Although the extended defect-free crystal was successfully grown, the MQS may contain point defects acting as the nonradiative recombination centers. The AlGaN underlying shell was found to be effective point defect trap to improve the optical property of the MQS.
关键词： AlGaN,optical property,point defect,multi-quantum shell,nanowire
更新于2025-09-11 14:15:04
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The Adjusted Optical Properties for Galileo/BeiDou-2/QZS-1 Satellites and Initial Results on BeiDou-3e and QZS-2 satellites
摘要： Solar Radiation Pressure (SRP) is the dominant non-gravitational perturbation for GNSS (Global Navigation Satellite System) satellites. In the absence of precise surface models, the Empirical CODE Orbit Models (ECOM, ECOM2) are widely used in GNSS satellite orbit determination. Based on previous studies, the use of an a priori box-wing model enhances the ECOM model, especially if the spacecraft is a stretched body satellite. However, so far not all the GNSS system providers have published their metadata. To ensure a precise use of the a priori box-wing model, we estimate the optical parameters of all the Galileo, BeiDou-2, and QZS-1 (Quasi Zenith Satellite System) satellites based on the physical processes from SRP to acceleration. Validation using orbit prediction proves that the adjusted parameters of Galileo and QZS-1 satellites exhibit almost the same performance as the corresponding published and ”best guess” values. Whereas, the estimated parameters of BeiDou-2 satellites demonstrate an improvement of more than 60% over the initial ”guess” values. The resulting optical parameters of all the satellites are introduced into an a priori box-wing model, which is jointly used with ECOM and ECOM2 model in the orbit determination. Results show that the pure ECOM2 model exhibits better performance than the pure ECOM model for Galileo, BeiDou-2 GEO and QZS-1 orbits. Combined with the a priori box-wing model the ECOM model (ECOM+BW) results in the best Galileo, BeiDou-2 GEO and QZS-1 orbits. The standard deviation (STD) of satellite laser ranging residuals reduce by about 20% and 5% with respect to the pure ECOM2 model for Galileo and BeiDou-2 GEO orbits, while the reductions are about 40% and 60% for QZS-1 orbits in yaw-steering and orbit-normal mode respectively. BeiDou-2 IGSO and MEO satellite orbits do not bene?t much from the a priori box-wing model. In summary, we suggest setting up a uni?ed SRP model of ECOM+BW for Galileo, QZS-1, and BeiDou-2 orbits based on the adjusted metadata. In addition, we estimate the optical parameters of BeiDou-3e and QZS-2 satellites using a limited number of tracking stations. Results regarding the uni?ed SRP model indicate the same advantages, the STD of satellite laser ranging residuals reduces by about 30% and 20% for QZS-2 and BeiDou-3e orbits respectively over orbit products without a priori model. The estimation procedure is e?ective and easy to apply to the new emerging satellites in the future.
关键词： Box-wing model,Optical property adjustment,Solar radiation pressure model,Metadata,QZS-2 and BeiDou-3e
更新于2025-09-10 09:29:36