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Controlled Sputtering Pressure on High-Quality Sb2Se3 Thin Film for Substrate Configurated Solar Cells
摘要： Magnetron sputtering has become an effective method in Sb2Se3 thin film photovoltaic. Research found that post-selenization treatments are essential to produce stoichiometric thin films with desired crystallinity and orientation for the sputtered Sb2Se3. However, the influence of the sputtering process on Sb2Se3 device performance has rarely been explored. In this work, the working pressure effect was thoroughly studied for the sputtered Sb2Se3 thin film solar cells. High-quality Sb2Se3 thin film was obtained when a bilayer structure was applied by sputtering the film at a high (1.5 Pa) and a low working pressure (1.0 Pa) subsequently. Such bilayer structure was found to be beneficial for both crystallization and preferred orientation of the Sb2Se3 thin film. Lastly, an interesting power conversion efficiency (PCE) of 5.5% was obtained for the champion device.
关键词： Sb2Se3,magnetron sputtering,substrate configuration,post-selenization,working pressure,thin film solar cell
更新于2025-09-23 15:19:57
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Direct transfer of the CVD-grown graphene on copper foils on SiO2 substrate under supercritical CO2 assisted-cleaning technique
摘要： The transfer of CVD-grown graphene sheets onto arbitrary substrates is important for the development of practical applications. Unfortunately, designing a low cost and highly efficient graphene transfer technique to achieve defect-free graphene sheets with low contact resistance onto various substrates still remains a challenge. In this paper, a CVD grown monolayer graphene sheet was directly transferred on SiO2/Si substrate. We found that a combination of floating copper with graphene films on ammonium persulfate solution with an original method of supercritical CO2 fluid can effectively produce clean and dry samples without damaging the crystalline quality of graphene. This method does not require any polymeric material to be desposited on the graphene films at any stage. Samples are analyzed by optical microscopy, Raman spectroscopy, scanning electron microscopy and atomic force microscopy. This method is very promising for cleaning graphene samples for electronic device fabrication.
关键词： transfer technique,supercritical CO2,SiO2 substrate,graphene,CVD
更新于2025-09-23 15:19:57
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Solution-shearing-processed flexible polymer solar mini sub-modules fabricated on an embedded silver-grid substrate
摘要： A flexible transparent electrode film is fabricated by coating the conductive polymer PEDOT:PSS using a solution-shearing process on PET film in which silver nanoparticles are embedded in intaglio grids patterned by a roll-to-roll thermal imprinting method. The composite electrode shows a sheet resistance of 20 Ω square?1 and a light transmittance of 82.9% at room temperature. An all-solution polymer solar mini sub-module is fabricated on the flexible electrode by further depositing ZnO and P3HT:PC61BM layers using the optimized solution-shearing process with subsequent printing of PEDOT:PSS and flat-screen printing of silver. The structure and morphology of the solution-shearing processed films examined by XRD and AFM show smoother surfaces and higher crystallinity than those of conventional spin-coated films. The solution-shearing-processed flexible polymer solar mini sub-module fabricated on an area of 36 cm2 shows a power conversion efficiency of 1.87% under an AM 1.5G solar simulator. Therefore, the solution-shearing process toward large-area flexible polymer solar module fabrication is successfully demonstrated.
关键词： Solution-shearing coating,Solar mini sub-module,Flexible transparent substrate,Large-area process
更新于2025-09-19 17:15:36
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Low pressure chemical vapor deposition of In <sub/>2</sub> O <sub/>3</sub> films on off-axis c-sapphire substrates
摘要： Heteroepitaxial In2O3 films were grown on transparent c-sapphire substrates with 0°, 3.5°, 6° and 8° off-axis angles via low pressure chemical vapor deposition (LPCVD). Metallic solid indium and oxygen gas were used as the precursors. X-ray diffraction (XRD) spectroscopy and cross-sectional scanning transmission electron microscopy (STEM) were used to study the effects of substrate off-axis on the crystalline quality of the as-grown films. The XRD 2θ-ω spectra confirmed the growth of body centered cubic bixbyite In2O3 films with (111) out-of-plane orientation. STEM images revealed the suppressed dislocation density in the films grown on substrates with off-axis angles. The crystal structure was further confirmed by Raman spectroscopy. Fifteen peaks corresponding to bcc-In2O3 Raman modes were observed at room temperature (RT). XRD ω-rocking curves, XRD Φ-scan profiles and STEM images indicate improved crystalline quality in films grown on substrates with, particularly, 3.5° and 6° off-cut angles. Growth rates in a wide range of ~ 0.5 - 30 μm/hr were achieved. RT photoluminescence peak at ~2.15 eV is attributed to the deep level defect transitions. RT photoluminescence excitation peak at ~3.38 eV corresponds to the optical bandgap of bcc-In2O3. RT electron Hall mobilities of ~ 88 - 116 cm2/V.s were measured with background carrier concentrations of ~ 6 - 9x1017 cm-3.
关键词： low pressure chemical vapor deposition,Indium oxide,off-axis substrate,c-sapphire
更新于2025-09-19 17:15:36
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Compact Printed Log-periodic Dipole Arrays Fed by SIW Horn
摘要： Substrate integrated waveguide (SIW) horn is a good planar feeding structure for planar antennas and arrays. In this letter, a 18 printed log-periodic dipole array (LPDA) antenna fed by a compact SIW horn is presented. Some linear arrays of metal vias are embedded inside the SIW horn to correct the phase and amplitude distributions on the horn aperture. The measured gain of the proposed antenna is 9.61 dBi, the half power beam-width is 18.1, the FTBR is 17.55 dB, the cross polarization in the axis direction is 21.48 dB, and the side-lobe lever is -14.93 dB at 10 GHz. Good agreement between the simulated and the measured results is obtained.
关键词： planar horn,Log-periodic dipole array (LPDA),substrate integrated waveguide (SIW)
更新于2025-09-19 17:15:36
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[BestMasters] Topographic Organization of the Pectine Neuropils in Scorpions (An Analysis of Chemosensory Afferents and the Projection Pattern in the Central Nervous System) || Organised Colloidal Metal Nanoparticles for LSPR Refractive Index Transducers
摘要： This work is focused on optimizing adhesion and distribution of colloidal gold nanoparticles on silanized glass substrates intended as nanostructured plasmonic transducer for sensing applications. This system will be used as platform for subsequent functionalization and/or enzyme immobilization. All preparation steps have been monitored by UV-Vis absorption spectroscopy and X-ray photoelectron spectroscopy (XPS).
关键词： Surface plasmon resonance,Silanized substrate,Gold nanoparticles
更新于2025-09-19 17:15:36
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Design of terahertz photoconductive antenna arrays based on defective photonic crystal substrates
摘要： In this paper, arrays of two different terahertz (THz) antennas based on defective photonic crystal (DPC) substrates are proposed and their radiation characteristics are investigated by using full-wave simulation. We show that employing DPC substrates in THz photoconductive antenna (PCA) arrays reduces the amount of power coupled to the substrate surface waves and, as a result, decreases the mutual coupling between the elements of the antenna array and increases the directivity in the boresight direction. By studying 1 × 2 arrays of bowtie and four-leaf-clover-shaped antennas, we show that either the improvement of directivity in a broad bandwidth or the enhancement of photomixer antenna impedance at a resonant frequency can be considered in the design of the DPC substrate. Therefore, the proposed approach can significantly improve the efficiency and radiation performance of THz photomixer antennas resulting in an improved effective THz radiated power in the desirable direction. The proposed DPC substrate can be considered as a way to realize sub-millimeter-sized dielectric resonator antennas at terahertz frequencies. In addition, this cost-effective technique can reduce the necessity of exploiting hyper-hemispherical Si lenses by overcoming the adverse effects of the thick substrate which is of prime importance in PCA arrays from a practical viewpoint.
关键词： Arrays,Defective photonic crystal substrate,Propagation waves,Terahertz antennas
更新于2025-09-19 17:15:36
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Sol–Gel-Processed Organic–Inorganic Hybrid for Flexible Conductive Substrates Based on Gravure-Printed Silver Nanowires and Graphene
摘要： In this study, an organic–inorganic (O–I) nanohybrid obtained by incorporating an alkoxysilane-functionalized amphiphilic polymer precursor into a SiO2–TiO2 hybrid network was successfully utilized as a buffer layer to fabricate a flexible, transparent, and stable conductive substrate for solution-processed silver nanowires (AgNWs) and graphene under ambient conditions. The resulting O–I nanohybrid sol (denoted as AGPTi) provided a transmittance of the spin-coated AgNWs on an AGPTi-coated glass of 99.4% and high adhesion strength after a 3M tape test, with no visible changes in the AgNWs. In addition, AGPTi acted as a highly functional buffer layer, absorbing the applied pressure between the conductive materials, AgNWs and graphene, and rigid substrate, leading to a significant reduction in sheet resistance. Furthermore, gravure-printed AgNWs and graphene on the AGPTi-based flexible substrate had uniform line widths of 490 ± 15 and 470 ± 12 μm, with 1000-cycle bending durabilities, respectively.
关键词： gravure printing,flexible electronics,nanomaterials,conductive substrate
更新于2025-09-19 17:15:36
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Structure and Phase Composition of a Ti Film–Al Substrate System Irradiated with an Intense Pulsed Electron Beam
摘要： Commercially pure A7 aluminum was exposed to surface modification in a single vacuum cycle which included vacuum arc evaporation and deposition of commercially pure titanium and intense electron beam irradiation and melting of the film–substrate system using a plasma-cathode pulsed electron source. The deposited Ti film thickness was 0.5 and 1 μm. The irradiated Ti–Al system revealed a multilayer multiphase structure consisting of submicro- and nanosized elements with intermetallic inclusions Al3Ti, Al2Ti, and TiAl3. The Ti film during irradiation broke up into fragments with their immersion in the molten Al surface layer to a depth of 20 μm. The modified material surpassed the initial aluminum in wear resistance by a factor of 2.4 and in microhardness by a factor larger than 4. The main cause for the high surface hardness and high wear resistance of the modified aluminum was likely the formation of both the intermetallic particles and the Ti-hardened transition layer.
关键词： low-energy high-current electron beams,commercially pure aluminum,commercially pure titanium,film–substrate system,properties,structure
更新于2025-09-19 17:15:36
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Flexible and recyclable SERS substrate fabricated by decorated TiO2 film with Ag NPs on the cotton fabric
摘要： Flexible and recyclable surface-enhanced Raman scattering (SERS) substrate was fabricated based on woven cotton fabric by grafting Ag nanoparticle on the TiO2 film which was deposited on the cotton fabric. Due to the synergetic effect of heterostructure Ag/TiO2 and superior adsorption capacity of fabrics, recyclable SERS cotton fabric (RSCF) possessed excellent SERS sensitivity with a detected concentration of p-Aminothiophenol as low as 10-12 M. Furthermore, SERS performance of RSCF can be recovered after 180 min in the presence of UV light illumination, resulting from the photocatalytic property of TiO2 on the surface of RSCF. It can be further utilized to reproduce SERS performance of the RSCF through the UV-assisted cleaning. As a trial for potential application, based on the flexibility of cotton fabric, RSCF was employed to detect a pesticide (carbaryl) on the surface of a pear by simply swabbing and low concentration down to 10-4 M was reached. This work provides a potential guide towards the universal design of the flexible and recyclable SERS substrates for a promising application in the SERS rapid detection of trace-level toxic pollutants on the food.
关键词： Recyclability,Cotton fabric,SERS substrate,Swabbing,Flexibility
更新于2025-09-19 17:15:36