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Structure, thermal stability and optical simulation of ZrB2 based spectrally selective solar absorber coatings
摘要： In the present work, a solar selective coating of ZrB2/Al2O3 was deposited onto stainless steel (SS) substrates using a magnetron sputtering system. The coating exhibited an good selective absorbing properties with an absorptance of 0.92 and an emittance of 0.11. To investigate the thermal stability of the coating, the samples were annealed at 500 °C and 600 °C for 100 h, respectively. Experimental results indicated that the coating was thermally stable at 500 °C. The structure and optical properties of the coating is also characterized using ultra-high resolution scanning electron microscope, UV–vis–NIR spectrophotometer, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS). The re?ectance spectra of the SS/ZrB2/Al2O3 coating was successfully simulated by CODE software.
关键词： Solar absorber coating,Optical simulation,Structure,Thermal stability
更新于2025-09-19 17:15:36
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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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Fabrication of Two-Dimensional Crystalline Organic Films by Tilted Spin Coating for High-Performance Organic Field-Effect Transistors
摘要： We developed a facile method for fabricating large-area two-dimensional (2D) organic highly crystalline films and extended it to organic thin-film transistor arrays. Tilted spinning provided oriented flow at the three-phase contact line and 2D crystalline film that consisted of layer-by-layer stacked 2,7-diocty[1]benzothieno[3,2-b]benzothiophene (C8-BTBT) was obtained facilely for organic thin-film transistor (OTFT). The extracted field-effect mobility is 4.6 cm-2 V-1 s-1 but with non-ideal features. By applying this method to microdroplet arrays, oriented crystal was fabricated, and the channel region for OTFTs was covered by adjusting the spinning speed. By tuning the tilt angle (θ) of the revolving substrate, we fabricated high-performance OTFT arrays with average and maximum mobilities of 7.5 and 10.1 cm-2 V-1 s-1, respectively, that exhibited high reliability factors of over 90 % and were closed to ideal transistors. These results suggest that high-quality crystalline film can be obtained via a facile tilted spinning method.
关键词： oriented flow,reliability factor,tilted spin coating,two-dimensional,highly crystalline film
更新于2025-09-19 17:15:36
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Physical manipulation of ultrathin-film optical interference for super absorption and two-dimensional heterojunction photoconversion
摘要： Ultrathin optical interference in a system composed of absorbing material and metal reflector has attracted extensive attention due to its potential application in realizing highly efficient optical absorption by using extremely thin semiconductor material. In this paper, we study the physics behind the high absorption of ultrathin film from the viewpoint of destructive interference and admittance matching, particularly addressing the phase evolution by light propagation and interface reflection. The physical manipulations of the ultrathin interference effect by controlling the substrate material and semiconductor material/thickness are examined. We introduce typical two-dimensional materials — i.e., MoS2 and WSe2 — as the absorbing layer with thickness below 10 nm, which exhibits ～ 90% absorption in a large range of incident angle (0? ～ 70?). According to the ultrathin interference mechanism, we propose the ultrathin (< 20 nm) MoS2/WSe2 heterojunction for photovoltaic application and carefully examine the detailed optoelectronic responses by coupled multiphysics simulation. By comparing the same cells on SiO2 substrate, both the short-circuit current density (up to 20 mA/cm2) and the photoelectric conversion efficiency (up to 9.5%) are found to be increased by ～ 200%.
关键词： photovoltaic,interference coating,subwavelength structures
更新于2025-09-19 17:15:36
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Transistor Characteristics of Single Crystalline C<sub>8</sub>-BTBT Grown in Coated Liquid Crystal Solution on Photo-Alignment Films
摘要： We examined single crystal growth of benzothienobenzothiophene-based organic semiconductors by solution coating method using liquid crystal and investigated its electrical characteristics. As the results, we revealed that the averaged mobility in the saturation region reached 2.08 cm2/Vs along crystalline b-axis, and 1.08 cm2/Vs along crystalline a-axis.
关键词： organic semiconductor,liquid crystal solvent,single crystal,solution coating,organic field effect transistor
更新于2025-09-19 17:15:36
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Silver Nanowire Ink for Flexible Circuit on Textiles
摘要： Low cost electronics implemented in textiles could pave the way to a fully new generation of smart products in the fields of healthcare, sport, fashion, and safety. Although many methods have found their way into the market, many problems still need to be solved and much progress has to be made to enable the commercial exploitation of such products. In this paper, silver nanowires of 60–100 nm in diameter and 8–15 μm in length were achieved by the polyol solvothermal method, and aqueous silver nanowire conductive inks were prepared with the synthesized silver nanowires as the conductive phase, in the presence of polyaniline, guar, and hydrochloric acid. The conductive inks were printed on cotton fabric substrate by screen printing process. The effects of the amount of silver nanowires, layers of coating, and treatment temperature on the microstructure and electrical properties of samples were investigated by scanning electron microscopy and the four-point probe method. The results show that the conductivity and densification of the samples increased with increased amount of silver nanowires, layers of coating, and treatment temperature. The heat treatment helped to improve densification of the silver nanowires and conductivity of the sample. The resistance of the samples increased after bending due to loosening of the overlap between the silver nanowires.
关键词： conductive coating,silver nanowires,textile,conductivity
更新于2025-09-19 17:15:36
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Enhancing Output Power of Textured Silicon Solar Cells by Embedding Indium Plasmonic Nanoparticles in Layers within Antireflective Coating
摘要： In this study, we sought to enhance the output power and conversion efficiency of textured silicon solar cells by layering two-dimensional indium nanoparticles (In NPs) within a double-layer (SiNx/SiO2) antireflective coating (ARC) to induce plasmonic forward scattering. The plasmonic effects were characterized using Raman scattering, absorbance spectra, optical reflectance, and external quantum efficiency. We compared the optical and electrical performance of cells with and without single layers and double layers of In NPs. The conversion efficiency of the cell with a double layer of In NPs (16.97%) was higher than that of the cell with a single layer of In NPs (16.61%) and greatly exceeded that of the cell without In NPs (16.16%). We also conducted a comprehensive study on the light-trapping performance of the textured silicon solar cells with and without layers of In NPs within the double layer of ARC at angles from 0° to 75°. The total electrical output power of cells under air mass (AM) 1.5 G illumination was calculated. The application of a double layer of In NPs enabled an impressive 53.42% improvement in electrical output power (compared to the cell without NPs) thanks to the effects of plasmonic forward scattering.
关键词： textured silicon solar cells,antireflective coating (ARC),indium nanoparticles (In NPs),plasmonic forward scattering
更新于2025-09-19 17:15:36
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Fabrication of an Ultra-Thick-Oriented 3C-SiC Coating on the Inner Surface of a Graphite Tube by HHH-CVD
摘要： Cubic SiC (3C-SiC) is a promising material for nuclear industry applications due to its excellent properties. In this report, a highly oriented thick 3C-SiC coating with good crystallinity was prepared on the inner surface of a monolithic graphite tube via high-frequency induction-heated halide chemical vapor deposition (HHH-CVD) using SiCl4, CH4, and H2 as precursors. The texture coefficient (TC(hkl)), microstructure, and deposition rate along the tube axis was studied. 3C-SiC coating with a high (111) orientation and crystallinity was obtained. Along the tube axis, TC(111) was consistent with the temperature distribution. The surficial morphology of the 3C-SiC coating changed from pebble-like to hexangular facet and then to hemispherical. The deposition rate and coating thickness were 300 μm/h and 615 μm, respectively, which is sufficiently rapid and thick enough to obtain free-standing SiC tubes for nuclear reactors.
关键词： microstructure,orientation,3C-SiC coating,HHH-CVD
更新于2025-09-19 17:15:36
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The Study on Titanium Dioxide-Silica Binary Mixture Coated SrAl2O4: Eu2+, Dy3+ Phosphor as a Photoluminescence Pigment in a Waterborne Paint
摘要： After proper stimulation, long afterglow phosphors formulated as pigment in waterborne paints can emit light after the removal of the excitation light source. The encapsulation of SrAl2O4: Eu2+, Dy3+ phosphor by TiO2 and SiO2 individually, and in combination by a precipitation method was studied. The water resistance and photoluminescence behavior of the coated phosphors as a pigment for potential use in waterborne photoluminescence paints were evaluated. It revealed that the TiO2- SiO2 content coating layer was precipitated on the studied phosphor successfully. The higher trend of the TiO2 for coating on the phosphor when compared with the SiO2 was observed from EDS spectra. The SEM micrographs showed a continuous and uniform SiO2-TiO2 layer on the coated phosphor. Based on XRD results, the existence of the TiO2 in the coating layer had beneficial effect on the average crystallite size values. The pH solution versus time showed that the availability of the TiO2 in coated layer improved water resistance of the coated phosphor, although, in comparison with SiO2, it was less effective. The coated phosphor with TiO2 had the minimum afterglow brightness decay and consequently, it was recommended as a suitable pigment for waterborne photoluminescence paints.
关键词： TiO2,SiO2,Pigment,Phosphor,Coating,Waterborne paint
更新于2025-09-19 17:15:36
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Nanostructured Titanium Film Deposited by Pulsed Plasma Magnetron Sputtering (Pdms) on a High Voltage Ceramic Insulator for Outdoor Use
摘要： In this study, the cold plasma technique was used to produce nanometric titanium films with hydrophobic and anti-fouling properties. The films where deposited on porcelain electrical insulators surfaces to minimize the effects of leakage current. The magnetron sputtering technique was used with a target of pure titanium sheet, and argon as the ionization gas. The deposited films present an average thickness of 58 to 350 nm. After coating the insulators, the assays performed indicated a greater degree of hydrophobicity and maintenance of leakage current after exposure to salt spray. Lower leakage current values were observed in both natural and saline environments compared with the uncoated device.
关键词： hydrophobicity,electrical insulator,nanometric coating,cold plasma,titanium
更新于2025-09-19 17:15:36